Infectious Diseases

For those who view fractional ablative laser–assisted drug delivery as a pie-in-the-sky procedure that will take years to work its way into routine clinical practice, think again.

According to Merete Haedersdal, MD, PhD, DMSc, fractional ablative laser–assisted drug delivery is now ready to be incorporated into daily practice for the treatment of actinic keratoses (AKs) and scars, which is off-label use.

“The groundwork has been established over a decade with more than 100 publications available on PubMed,” Dr. Haedersdal, professor of dermatology at the University of Copenhagen, said during a virtual course on laser and aesthetic skin therapy. “There is no doubt that by drilling tiny little holes or channels with ablative fractional lasers, we enhance drug delivery to the skin, and we also empower different topical treatment regimens. Also, laser-assisted drug delivery holds the potential to bring new innovations into established medicine.”

Many studies have demonstrated that clinicians can enhance drug uptake into the skin with the fractional 10,600 nm CO₂ laser, the fractional 2,940 nm erbium:YAG laser, and the 1,927 nm thulium laser, but proper tuning of the devices is key. The lower the density, the better, Dr. Haedersdal said.

“Typically, we use 5% density or 5% coverage, sometimes 10%-15%, but don’t go higher in order to avoid the risk of having a systemic uptake,” she said during the meeting, which was sponsored by Harvard Medical School, Massachusetts General Hospital, and the Wellman Center for Photomedicine. “Also, the pulse energy for channel depth needs to be tailored to the specific dermatologic disease being treated,” she said, noting that for melasma, for example, “very low pulse energies” would be used, but they would be higher for treating thicker lesions, such as a hypertrophic scar.

Treatment with ablative fractional lasers enhances drug accumulation in the skin of any drug or substance applied to the skin, and clinical indications are expanding rapidly. Established indications include combining ablative fractional lasers and photodynamic therapy (PDT) for AKs and combining ablative fractional lasers and triamcinolone or 5-FU for scars. “Although we have a good body of evidence, particularly for AKs, it’s still an off-label use,” she emphasized.

Evolving indications include concomitant use of ablative fractional laser and vitamins and cosmeceuticals for rejuvenation; lidocaine for local anesthetics; tranexamic acid and hydroquinone for melasma; antifungals for onychomycosis; Botox for hyperhidrosis; minoxidil for alopecia; and betamethasone for vitiligo. A promising treatment for skin cancer “on the horizon,” she said, is the “combination of ablative fractional laser with PD1 inhibitors and chemotherapy.”

Data on AKs

Evidence supporting laser-assisted drug delivery for AKs comes from more than 10 randomized, controlled trials in the dermatology literature involving 400-plus immunocompetent and immunosuppressed patients. These trials have found ablative fractional laser–assisted PDT to be significantly more efficacious than PDT alone up to 12 months postoperatively and to foster lower rates of AK recurrence.

In a meta-analysis and systematic review, German researchers concluded that PDT combined with ablative laser treatment for AKs is more efficient but not more painful than either therapy alone. They recommended the combined regimen for patients with severe photodamage, field cancerization, and multiple AKs.

In 2020, an international consensus panel of experts, including Dr. Haedersdal, published recommendations regarding laser treatment of traumatic scars and contractures. The panel members determined that laser-assisted delivery of corticosteroids and antimetabolites was recommended for hypertrophic scars and cited triamcinolone acetonide suspension (TAC) as the most common corticosteroid used in combination with ablative fractional lasers. “It can be applied in concentrations of 40 mg/mL or less depending on the degree of hypertrophy,” they wrote.

In addition, they stated that 5-FU solution is “most commonly applied in a concentration of 50 mg/mL alone, or mixed with TAC in ratios of 9:1 or 3:1.”

According to the best available evidence, the clinical approach for hypertrophic scars supports combination treatment with ablative fractional laser and triamcinolone acetonide either alone or in combination with 5-FU. For atrophic scars, laser-assisted delivery of poly-L-lactic acid has been shown to be efficient. “Both of these treatments improve texture and thickness but also dyschromia and scar functionality,” said Dr. Haedersdal, who is also a visiting scientist at the Wellman Center for Photomedicine, Boston.

Commenting on patient safety with laser-assisted drug delivery, “the combination of lasers and topicals can be a powerful cocktail,” she said. “You can expect intensified local skin reactions. When treating larger areas, consider the risk of systemic absorption and the risk of potential toxicity. There is also the potential for infection with pathogens such as Staphylococcus aureus. The take-home message here is that you should only use the type and amount of drug no higher than administered during intradermal injection.”

Dr. Haedersdal disclosed that she has received equipment from Cherry Imaging, Cynosure-Hologic, MiraDry, and PerfAction Technologies. She has also received research grants from Leo Pharma, Lutronic, Mirai Medical, Novoxel, and Venus Concept.

For those who view fractional ablative laser–assisted drug delivery as a pie-in-the-sky procedure that will take years to work its way into routine clinical practice, think again.

According to Merete Haedersdal, MD, PhD, DMSc, fractional ablative laser–assisted drug delivery is now ready to be incorporated into daily practice for the treatment of actinic keratoses (AKs) and scars, which is off-label use.

“The groundwork has been established over a decade with more than 100 publications available on PubMed,” Dr. Haedersdal, professor of dermatology at the University of Copenhagen, said during a virtual course on laser and aesthetic skin therapy. “There is no doubt that by drilling tiny little holes or channels with ablative fractional lasers, we enhance drug delivery to the skin, and we also empower different topical treatment regimens. Also, laser-assisted drug delivery holds the potential to bring new innovations into established medicine.”

Many studies have demonstrated that clinicians can enhance drug uptake into the skin with the fractional 10,600 nm CO₂ laser, the fractional 2,940 nm erbium:YAG laser, and the 1,927 nm thulium laser, but proper tuning of the devices is key. The lower the density, the better, Dr. Haedersdal said.

“Typically, we use 5% density or 5% coverage, sometimes 10%-15%, but don’t go higher in order to avoid the risk of having a systemic uptake,” she said during the meeting, which was sponsored by Harvard Medical School, Massachusetts General Hospital, and the Wellman Center for Photomedicine. “Also, the pulse energy for channel depth needs to be tailored to the specific dermatologic disease being treated,” she said, noting that for melasma, for example, “very low pulse energies” would be used, but they would be higher for treating thicker lesions, such as a hypertrophic scar.

Treatment with ablative fractional lasers enhances drug accumulation in the skin of any drug or substance applied to the skin, and clinical indications are expanding rapidly. Established indications include combining ablative fractional lasers and photodynamic therapy (PDT) for AKs and combining ablative fractional lasers and triamcinolone or 5-FU for scars. “Although we have a good body of evidence, particularly for AKs, it’s still an off-label use,” she emphasized.

Evolving indications include concomitant use of ablative fractional laser and vitamins and cosmeceuticals for rejuvenation; lidocaine for local anesthetics; tranexamic acid and hydroquinone for melasma; antifungals for onychomycosis; Botox for hyperhidrosis; minoxidil for alopecia; and betamethasone for vitiligo. A promising treatment for skin cancer “on the horizon,” she said, is the “combination of ablative fractional laser with PD1 inhibitors and chemotherapy.”

Data on AKs

Evidence supporting laser-assisted drug delivery for AKs comes from more than 10 randomized, controlled trials in the dermatology literature involving 400-plus immunocompetent and immunosuppressed patients. These trials have found ablative fractional laser–assisted PDT to be significantly more efficacious than PDT alone up to 12 months postoperatively and to foster lower rates of AK recurrence.

In a meta-analysis and systematic review, German researchers concluded that PDT combined with ablative laser treatment for AKs is more efficient but not more painful than either therapy alone. They recommended the combined regimen for patients with severe photodamage, field cancerization, and multiple AKs.

In 2020, an international consensus panel of experts, including Dr. Haedersdal, published recommendations regarding laser treatment of traumatic scars and contractures. The panel members determined that laser-assisted delivery of corticosteroids and antimetabolites was recommended for hypertrophic scars and cited triamcinolone acetonide suspension (TAC) as the most common corticosteroid used in combination with ablative fractional lasers. “It can be applied in concentrations of 40 mg/mL or less depending on the degree of hypertrophy,” they wrote.

In addition, they stated that 5-FU solution is “most commonly applied in a concentration of 50 mg/mL alone, or mixed with TAC in ratios of 9:1 or 3:1.”

According to the best available evidence, the clinical approach for hypertrophic scars supports combination treatment with ablative fractional laser and triamcinolone acetonide either alone or in combination with 5-FU. For atrophic scars, laser-assisted delivery of poly-L-lactic acid has been shown to be efficient. “Both of these treatments improve texture and thickness but also dyschromia and scar functionality,” said Dr. Haedersdal, who is also a visiting scientist at the Wellman Center for Photomedicine, Boston.

Commenting on patient safety with laser-assisted drug delivery, “the combination of lasers and topicals can be a powerful cocktail,” she said. “You can expect intensified local skin reactions. When treating larger areas, consider the risk of systemic absorption and the risk of potential toxicity. There is also the potential for infection with pathogens such as Staphylococcus aureus. The take-home message here is that you should only use the type and amount of drug no higher than administered during intradermal injection.”

Dr. Haedersdal disclosed that she has received equipment from Cherry Imaging, Cynosure-Hologic, MiraDry, and PerfAction Technologies. She has also received research grants from Leo Pharma, Lutronic, Mirai Medical, Novoxel, and Venus Concept.

For those who view fractional ablative laser–assisted drug delivery as a pie-in-the-sky procedure that will take years to work its way into routine clinical practice, think again.

According to Merete Haedersdal, MD, PhD, DMSc, fractional ablative laser–assisted drug delivery is now ready to be incorporated into daily practice for the treatment of actinic keratoses (AKs) and scars, which is off-label use.

“The groundwork has been established over a decade with more than 100 publications available on PubMed,” Dr. Haedersdal, professor of dermatology at the University of Copenhagen, said during a virtual course on laser and aesthetic skin therapy. “There is no doubt that by drilling tiny little holes or channels with ablative fractional lasers, we enhance drug delivery to the skin, and we also empower different topical treatment regimens. Also, laser-assisted drug delivery holds the potential to bring new innovations into established medicine.”

Many studies have demonstrated that clinicians can enhance drug uptake into the skin with the fractional 10,600 nm CO₂ laser, the fractional 2,940 nm erbium:YAG laser, and the 1,927 nm thulium laser, but proper tuning of the devices is key. The lower the density, the better, Dr. Haedersdal said.

“Typically, we use 5% density or 5% coverage, sometimes 10%-15%, but don’t go higher in order to avoid the risk of having a systemic uptake,” she said during the meeting, which was sponsored by Harvard Medical School, Massachusetts General Hospital, and the Wellman Center for Photomedicine. “Also, the pulse energy for channel depth needs to be tailored to the specific dermatologic disease being treated,” she said, noting that for melasma, for example, “very low pulse energies” would be used, but they would be higher for treating thicker lesions, such as a hypertrophic scar.

Treatment with ablative fractional lasers enhances drug accumulation in the skin of any drug or substance applied to the skin, and clinical indications are expanding rapidly. Established indications include combining ablative fractional lasers and photodynamic therapy (PDT) for AKs and combining ablative fractional lasers and triamcinolone or 5-FU for scars. “Although we have a good body of evidence, particularly for AKs, it’s still an off-label use,” she emphasized.

Evolving indications include concomitant use of ablative fractional laser and vitamins and cosmeceuticals for rejuvenation; lidocaine for local anesthetics; tranexamic acid and hydroquinone for melasma; antifungals for onychomycosis; Botox for hyperhidrosis; minoxidil for alopecia; and betamethasone for vitiligo. A promising treatment for skin cancer “on the horizon,” she said, is the “combination of ablative fractional laser with PD1 inhibitors and chemotherapy.”

Data on AKs

Evidence supporting laser-assisted drug delivery for AKs comes from more than 10 randomized, controlled trials in the dermatology literature involving 400-plus immunocompetent and immunosuppressed patients. These trials have found ablative fractional laser–assisted PDT to be significantly more efficacious than PDT alone up to 12 months postoperatively and to foster lower rates of AK recurrence.

In a meta-analysis and systematic review, German researchers concluded that PDT combined with ablative laser treatment for AKs is more efficient but not more painful than either therapy alone. They recommended the combined regimen for patients with severe photodamage, field cancerization, and multiple AKs.

In 2020, an international consensus panel of experts, including Dr. Haedersdal, published recommendations regarding laser treatment of traumatic scars and contractures. The panel members determined that laser-assisted delivery of corticosteroids and antimetabolites was recommended for hypertrophic scars and cited triamcinolone acetonide suspension (TAC) as the most common corticosteroid used in combination with ablative fractional lasers. “It can be applied in concentrations of 40 mg/mL or less depending on the degree of hypertrophy,” they wrote.

In addition, they stated that 5-FU solution is “most commonly applied in a concentration of 50 mg/mL alone, or mixed with TAC in ratios of 9:1 or 3:1.”

According to the best available evidence, the clinical approach for hypertrophic scars supports combination treatment with ablative fractional laser and triamcinolone acetonide either alone or in combination with 5-FU. For atrophic scars, laser-assisted delivery of poly-L-lactic acid has been shown to be efficient. “Both of these treatments improve texture and thickness but also dyschromia and scar functionality,” said Dr. Haedersdal, who is also a visiting scientist at the Wellman Center for Photomedicine, Boston.

Commenting on patient safety with laser-assisted drug delivery, “the combination of lasers and topicals can be a powerful cocktail,” she said. “You can expect intensified local skin reactions. When treating larger areas, consider the risk of systemic absorption and the risk of potential toxicity. There is also the potential for infection with pathogens such as Staphylococcus aureus. The take-home message here is that you should only use the type and amount of drug no higher than administered during intradermal injection.”

Dr. Haedersdal disclosed that she has received equipment from Cherry Imaging, Cynosure-Hologic, MiraDry, and PerfAction Technologies. She has also received research grants from Leo Pharma, Lutronic, Mirai Medical, Novoxel, and Venus Concept.

Soil-dwelling fungi that can cause lung infections are more widespread than most doctors thought, sometimes leading to missed diagnoses, according to a new study. 

Researchers studying fungi-linked lung infections realized that many infections were occurring in places the fungi weren’t thought to exist. They found that maps doctors use to know if the fungi are a threat in their area hadn’t been updated in half a century.

“Recently, we are finding more cases of these diseases outside their known areas, taking clinicians and patients by surprise,” University of California, Davis infectious disease professor George Thompson, MD, said in a commentary published along with the study.

Published in the journal Clinical Infectious Diseases, the study sought to identify illnesses linked to three types of soil fungi in the United States that are known to cause lung infections. They are called histoplasma, blastomyces, and coccidioides, the latter of which causes an illness known as Valley fever, which has been on the rise in California.

Researchers used data for more than 45 million people who use Medicare and found that at least 1 of these 3 fungi are present in 48 of 50 U.S. states and Washington, D.C.

Symptoms after breathing in the fungi spores include fever and cough and can be similar to symptoms of other illnesses, according to the Centers for Disease Control.

The researchers said health care providers need to increase their suspicion for these fungi, which “would likely result in fewer missed diagnoses, fewer diagnostic delays, and improved patient outcomes.”

A version of this article first appeared on WebMD.com.

Soil-dwelling fungi that can cause lung infections are more widespread than most doctors thought, sometimes leading to missed diagnoses, according to a new study. 

Researchers studying fungi-linked lung infections realized that many infections were occurring in places the fungi weren’t thought to exist. They found that maps doctors use to know if the fungi are a threat in their area hadn’t been updated in half a century.

“Recently, we are finding more cases of these diseases outside their known areas, taking clinicians and patients by surprise,” University of California, Davis infectious disease professor George Thompson, MD, said in a commentary published along with the study.

Published in the journal Clinical Infectious Diseases, the study sought to identify illnesses linked to three types of soil fungi in the United States that are known to cause lung infections. They are called histoplasma, blastomyces, and coccidioides, the latter of which causes an illness known as Valley fever, which has been on the rise in California.

Researchers used data for more than 45 million people who use Medicare and found that at least 1 of these 3 fungi are present in 48 of 50 U.S. states and Washington, D.C.

Symptoms after breathing in the fungi spores include fever and cough and can be similar to symptoms of other illnesses, according to the Centers for Disease Control.

The researchers said health care providers need to increase their suspicion for these fungi, which “would likely result in fewer missed diagnoses, fewer diagnostic delays, and improved patient outcomes.”

A version of this article first appeared on WebMD.com.

Soil-dwelling fungi that can cause lung infections are more widespread than most doctors thought, sometimes leading to missed diagnoses, according to a new study. 

Researchers studying fungi-linked lung infections realized that many infections were occurring in places the fungi weren’t thought to exist. They found that maps doctors use to know if the fungi are a threat in their area hadn’t been updated in half a century.

“Recently, we are finding more cases of these diseases outside their known areas, taking clinicians and patients by surprise,” University of California, Davis infectious disease professor George Thompson, MD, said in a commentary published along with the study.

Published in the journal Clinical Infectious Diseases, the study sought to identify illnesses linked to three types of soil fungi in the United States that are known to cause lung infections. They are called histoplasma, blastomyces, and coccidioides, the latter of which causes an illness known as Valley fever, which has been on the rise in California.

Researchers used data for more than 45 million people who use Medicare and found that at least 1 of these 3 fungi are present in 48 of 50 U.S. states and Washington, D.C.

Symptoms after breathing in the fungi spores include fever and cough and can be similar to symptoms of other illnesses, according to the Centers for Disease Control.

The researchers said health care providers need to increase their suspicion for these fungi, which “would likely result in fewer missed diagnoses, fewer diagnostic delays, and improved patient outcomes.”

A version of this article first appeared on WebMD.com.

Measles has sickened 59 children in an outbreak that began in November and now spans four Ohio counties.

None of the children had been fully vaccinated against measles, and 23 of them have been hospitalized, local officials report.

“Measles can be very serious, especially for children under age 5,” Columbus Public Health spokesperson Kelli Newman told CNN.

Nearly all of the infected children are under age 5, with 12 of them being under 1 year old. 

“Many children are hospitalized for dehydration,” Ms. Newman told CNN in an email. “Other serious complications also can include pneumonia and neurological conditions such as encephalitis. There’s no way of knowing which children will become so sick they have to be hospitalized. The safest way to protect children from measles is to make sure they are vaccinated with MMR.”

Of the 59 infected children, 56 were unvaccinated and three had been partially vaccinated. The MMR (measles, mumps, and rubella) vaccine is recommended for children beginning at 12 months old, according to the Centers for Disease Control and American Academy of Pediatrics. Two doses are needed to be considered fully vaccinated, and the second dose is usually given between 4 and 6 years old.

Measles “is one of the most infectious agents known to man,” the academy says.

It is so contagious that if one person has it, up to 9 out of 10 people around that person will also become infected if they are not protected, the CDC explains. Measles infection causes a rash and a fever that can spike beyond 104° F. Sometimes, the illness can lead to brain swelling, brain damage, or death.

Last month, the World Health Organization and CDC warned that 40 million children worldwide missed their measles vaccinations in 2021, partly due to pandemic disruptions. The American Academy of Pediatrics also notes that many parents choose not to vaccinate their children due to misinformation.

Infants are at heightened risk because they are too young to be vaccinated.

The academy offered several tips for protecting unvaccinated infants during a measles outbreak:

• Limit your baby’s exposure to crowds, other children, and people with cold symptoms.
• Disinfect objects and surfaces at home regularly, because the measles virus can live on surfaces or suspended in the air for 2 hours.
• If possible, feed your baby breast milk, because it has antibodies to prevent and fight infections.

A version of this article first appeared on WebMD.com.

Measles has sickened 59 children in an outbreak that began in November and now spans four Ohio counties.

None of the children had been fully vaccinated against measles, and 23 of them have been hospitalized, local officials report.

“Measles can be very serious, especially for children under age 5,” Columbus Public Health spokesperson Kelli Newman told CNN.

Nearly all of the infected children are under age 5, with 12 of them being under 1 year old. 

“Many children are hospitalized for dehydration,” Ms. Newman told CNN in an email. “Other serious complications also can include pneumonia and neurological conditions such as encephalitis. There’s no way of knowing which children will become so sick they have to be hospitalized. The safest way to protect children from measles is to make sure they are vaccinated with MMR.”

Of the 59 infected children, 56 were unvaccinated and three had been partially vaccinated. The MMR (measles, mumps, and rubella) vaccine is recommended for children beginning at 12 months old, according to the Centers for Disease Control and American Academy of Pediatrics. Two doses are needed to be considered fully vaccinated, and the second dose is usually given between 4 and 6 years old.

Measles “is one of the most infectious agents known to man,” the academy says.

It is so contagious that if one person has it, up to 9 out of 10 people around that person will also become infected if they are not protected, the CDC explains. Measles infection causes a rash and a fever that can spike beyond 104° F. Sometimes, the illness can lead to brain swelling, brain damage, or death.

Last month, the World Health Organization and CDC warned that 40 million children worldwide missed their measles vaccinations in 2021, partly due to pandemic disruptions. The American Academy of Pediatrics also notes that many parents choose not to vaccinate their children due to misinformation.

Infants are at heightened risk because they are too young to be vaccinated.

The academy offered several tips for protecting unvaccinated infants during a measles outbreak:

• Limit your baby’s exposure to crowds, other children, and people with cold symptoms.
• Disinfect objects and surfaces at home regularly, because the measles virus can live on surfaces or suspended in the air for 2 hours.
• If possible, feed your baby breast milk, because it has antibodies to prevent and fight infections.

A version of this article first appeared on WebMD.com.

Measles has sickened 59 children in an outbreak that began in November and now spans four Ohio counties.

None of the children had been fully vaccinated against measles, and 23 of them have been hospitalized, local officials report.

“Measles can be very serious, especially for children under age 5,” Columbus Public Health spokesperson Kelli Newman told CNN.

Nearly all of the infected children are under age 5, with 12 of them being under 1 year old. 

“Many children are hospitalized for dehydration,” Ms. Newman told CNN in an email. “Other serious complications also can include pneumonia and neurological conditions such as encephalitis. There’s no way of knowing which children will become so sick they have to be hospitalized. The safest way to protect children from measles is to make sure they are vaccinated with MMR.”

Of the 59 infected children, 56 were unvaccinated and three had been partially vaccinated. The MMR (measles, mumps, and rubella) vaccine is recommended for children beginning at 12 months old, according to the Centers for Disease Control and American Academy of Pediatrics. Two doses are needed to be considered fully vaccinated, and the second dose is usually given between 4 and 6 years old.

Measles “is one of the most infectious agents known to man,” the academy says.

It is so contagious that if one person has it, up to 9 out of 10 people around that person will also become infected if they are not protected, the CDC explains. Measles infection causes a rash and a fever that can spike beyond 104° F. Sometimes, the illness can lead to brain swelling, brain damage, or death.

Last month, the World Health Organization and CDC warned that 40 million children worldwide missed their measles vaccinations in 2021, partly due to pandemic disruptions. The American Academy of Pediatrics also notes that many parents choose not to vaccinate their children due to misinformation.

Infants are at heightened risk because they are too young to be vaccinated.

The academy offered several tips for protecting unvaccinated infants during a measles outbreak:

• Limit your baby’s exposure to crowds, other children, and people with cold symptoms.
• Disinfect objects and surfaces at home regularly, because the measles virus can live on surfaces or suspended in the air for 2 hours.
• If possible, feed your baby breast milk, because it has antibodies to prevent and fight infections.

A version of this article first appeared on WebMD.com.

Scarlet fever, commonly described in young children and adolescents, is characterized by a papular, blanching rash that may be described as having a “sandpaper” texture. This condition typically presents in the setting of Streptococcus pyogenes pharyngitis, or strep throat, and is spread via mucosal transfer in close proximity such as classrooms and nurseries. The dermatologic symptoms are a result of the endotoxin produced by S. pyogenes, which is part of the group A Strep bacteria. Clinically, the presentation can be differentiated from an allergic eruption by its relation to acute pharyngitis, insidious onset, and lack of confluence of the lesions. Diagnosis is supported by a throat culture and rapid strep test, although a rapid test lacks reliability in older patients who are less commonly affected and likely to be carriers. First-line treatment is penicillin or amoxicillin, but first-generation cephalosporins, clindamycin, or erythromycin are sufficient if the patient is allergic to penicillins. Prognosis worsens as time between onset and treatment increases, but is overall excellent now with the introduction of antibiotics and improved hygiene.

Scarlet fever is among a list of many common childhood rashes, and it can be difficult to differentiate between these pathologies on clinical presentation. A few notable childhood dermatologic eruptions include erythema infectiosum (fifth disease), roseola (exanthema subitum or sixth disease), and measles. These cases can be distinguished clinically by the age of the patient, distribution, and quality of the symptoms. Laboratory testing may be used to confirm the diagnosis.

Erythema infectiosum is known as fifth disease or slapped-cheek rash because it commonly presents on the cheeks as a pink, maculopapular rash in a reticular pattern. The disease is caused by parvovirus B19 and is accompanied by low fever, malaise, headache, sore throat, and nausea, which precedes the erythematous rash. The facial rash appears first and is followed by patchy eruptions on the extremities. Appearance of the rash typically indicates the patient is no longer contagious, and patients are treated symptomatically with NSAIDs and antihistamines for associated pruritus.

Roseola infantum is commonly caused by human herpesvirus 6 and is usually found in children 3 years and younger. The defining symptom is a high fever, which is paired with a mild cough, runny nose, and diarrhea. A maculopapular rash appears after the fever subsides, starting centrally and spreading outward to the extremities. Although this rash is similar to measles, they can be differentiated by the order of onset. The rash caused by measles begins on the face and mouth (Koplik spots) and moves downward. Additionally, the patient appears generally healthy and the disease is self-limiting in roseola, while patients with measles will appear more ill and require further attention. Measles is caused by the measles virus of the genus Morbillivirus and is highly contagious. It is spread via respiratory route presenting with fever, cough, coryza, and conjunctivitis followed by the rash. Fortunately, the measles vaccine is in widespread use, so cases have declined over the years.

Our patient had a positive strep test. Influenza and coronavirus tests were negative. She was started on daily amoxicillin and the rash resolved within 2 days of taking the antibiotics.

This case and photo were submitted by Lucas Shapiro, BS, Nova Southeastern University, Tampa, and Dr. Bilu Martin.

Dr. Bilu Martin is a board-certified dermatologist in private practice at Premier Dermatology, MD, in Aventura, Fla. More diagnostic cases are available at mdedge.com/dermatology. To submit a case for possible publication, send an email to dermnews@mdedge.com.

References

Allmon A et al.. Am Fam Physician. 2015 Aug 1;92(3):211-6.

Moss WJ. Lancet. 2017 Dec 2;390(10111):2490-502.

Mullins TB and Krishnamurthy K. Roseola Infantum, in “StatPearls.” Treasure Islan, Fla.: StatPearls Publishing, 2022.

Pardo S and Perera TB. Scarlet Fever, in “StatPearls.” Treasure Island, Fla.: StatPearls Publishing, 2022.
 

Scarlet fever, commonly described in young children and adolescents, is characterized by a papular, blanching rash that may be described as having a “sandpaper” texture. This condition typically presents in the setting of Streptococcus pyogenes pharyngitis, or strep throat, and is spread via mucosal transfer in close proximity such as classrooms and nurseries. The dermatologic symptoms are a result of the endotoxin produced by S. pyogenes, which is part of the group A Strep bacteria. Clinically, the presentation can be differentiated from an allergic eruption by its relation to acute pharyngitis, insidious onset, and lack of confluence of the lesions. Diagnosis is supported by a throat culture and rapid strep test, although a rapid test lacks reliability in older patients who are less commonly affected and likely to be carriers. First-line treatment is penicillin or amoxicillin, but first-generation cephalosporins, clindamycin, or erythromycin are sufficient if the patient is allergic to penicillins. Prognosis worsens as time between onset and treatment increases, but is overall excellent now with the introduction of antibiotics and improved hygiene.

Scarlet fever is among a list of many common childhood rashes, and it can be difficult to differentiate between these pathologies on clinical presentation. A few notable childhood dermatologic eruptions include erythema infectiosum (fifth disease), roseola (exanthema subitum or sixth disease), and measles. These cases can be distinguished clinically by the age of the patient, distribution, and quality of the symptoms. Laboratory testing may be used to confirm the diagnosis.

Erythema infectiosum is known as fifth disease or slapped-cheek rash because it commonly presents on the cheeks as a pink, maculopapular rash in a reticular pattern. The disease is caused by parvovirus B19 and is accompanied by low fever, malaise, headache, sore throat, and nausea, which precedes the erythematous rash. The facial rash appears first and is followed by patchy eruptions on the extremities. Appearance of the rash typically indicates the patient is no longer contagious, and patients are treated symptomatically with NSAIDs and antihistamines for associated pruritus.

Roseola infantum is commonly caused by human herpesvirus 6 and is usually found in children 3 years and younger. The defining symptom is a high fever, which is paired with a mild cough, runny nose, and diarrhea. A maculopapular rash appears after the fever subsides, starting centrally and spreading outward to the extremities. Although this rash is similar to measles, they can be differentiated by the order of onset. The rash caused by measles begins on the face and mouth (Koplik spots) and moves downward. Additionally, the patient appears generally healthy and the disease is self-limiting in roseola, while patients with measles will appear more ill and require further attention. Measles is caused by the measles virus of the genus Morbillivirus and is highly contagious. It is spread via respiratory route presenting with fever, cough, coryza, and conjunctivitis followed by the rash. Fortunately, the measles vaccine is in widespread use, so cases have declined over the years.

Our patient had a positive strep test. Influenza and coronavirus tests were negative. She was started on daily amoxicillin and the rash resolved within 2 days of taking the antibiotics.

This case and photo were submitted by Lucas Shapiro, BS, Nova Southeastern University, Tampa, and Dr. Bilu Martin.

Dr. Bilu Martin is a board-certified dermatologist in private practice at Premier Dermatology, MD, in Aventura, Fla. More diagnostic cases are available at mdedge.com/dermatology. To submit a case for possible publication, send an email to dermnews@mdedge.com.

References

Allmon A et al.. Am Fam Physician. 2015 Aug 1;92(3):211-6.

Moss WJ. Lancet. 2017 Dec 2;390(10111):2490-502.

Mullins TB and Krishnamurthy K. Roseola Infantum, in “StatPearls.” Treasure Islan, Fla.: StatPearls Publishing, 2022.

Pardo S and Perera TB. Scarlet Fever, in “StatPearls.” Treasure Island, Fla.: StatPearls Publishing, 2022.
 

Scarlet fever, commonly described in young children and adolescents, is characterized by a papular, blanching rash that may be described as having a “sandpaper” texture. This condition typically presents in the setting of Streptococcus pyogenes pharyngitis, or strep throat, and is spread via mucosal transfer in close proximity such as classrooms and nurseries. The dermatologic symptoms are a result of the endotoxin produced by S. pyogenes, which is part of the group A Strep bacteria. Clinically, the presentation can be differentiated from an allergic eruption by its relation to acute pharyngitis, insidious onset, and lack of confluence of the lesions. Diagnosis is supported by a throat culture and rapid strep test, although a rapid test lacks reliability in older patients who are less commonly affected and likely to be carriers. First-line treatment is penicillin or amoxicillin, but first-generation cephalosporins, clindamycin, or erythromycin are sufficient if the patient is allergic to penicillins. Prognosis worsens as time between onset and treatment increases, but is overall excellent now with the introduction of antibiotics and improved hygiene.

Scarlet fever is among a list of many common childhood rashes, and it can be difficult to differentiate between these pathologies on clinical presentation. A few notable childhood dermatologic eruptions include erythema infectiosum (fifth disease), roseola (exanthema subitum or sixth disease), and measles. These cases can be distinguished clinically by the age of the patient, distribution, and quality of the symptoms. Laboratory testing may be used to confirm the diagnosis.

Erythema infectiosum is known as fifth disease or slapped-cheek rash because it commonly presents on the cheeks as a pink, maculopapular rash in a reticular pattern. The disease is caused by parvovirus B19 and is accompanied by low fever, malaise, headache, sore throat, and nausea, which precedes the erythematous rash. The facial rash appears first and is followed by patchy eruptions on the extremities. Appearance of the rash typically indicates the patient is no longer contagious, and patients are treated symptomatically with NSAIDs and antihistamines for associated pruritus.

Roseola infantum is commonly caused by human herpesvirus 6 and is usually found in children 3 years and younger. The defining symptom is a high fever, which is paired with a mild cough, runny nose, and diarrhea. A maculopapular rash appears after the fever subsides, starting centrally and spreading outward to the extremities. Although this rash is similar to measles, they can be differentiated by the order of onset. The rash caused by measles begins on the face and mouth (Koplik spots) and moves downward. Additionally, the patient appears generally healthy and the disease is self-limiting in roseola, while patients with measles will appear more ill and require further attention. Measles is caused by the measles virus of the genus Morbillivirus and is highly contagious. It is spread via respiratory route presenting with fever, cough, coryza, and conjunctivitis followed by the rash. Fortunately, the measles vaccine is in widespread use, so cases have declined over the years.

Our patient had a positive strep test. Influenza and coronavirus tests were negative. She was started on daily amoxicillin and the rash resolved within 2 days of taking the antibiotics.

This case and photo were submitted by Lucas Shapiro, BS, Nova Southeastern University, Tampa, and Dr. Bilu Martin.

Dr. Bilu Martin is a board-certified dermatologist in private practice at Premier Dermatology, MD, in Aventura, Fla. More diagnostic cases are available at mdedge.com/dermatology. To submit a case for possible publication, send an email to dermnews@mdedge.com.

References

Allmon A et al.. Am Fam Physician. 2015 Aug 1;92(3):211-6.

Moss WJ. Lancet. 2017 Dec 2;390(10111):2490-502.

Mullins TB and Krishnamurthy K. Roseola Infantum, in “StatPearls.” Treasure Islan, Fla.: StatPearls Publishing, 2022.

Pardo S and Perera TB. Scarlet Fever, in “StatPearls.” Treasure Island, Fla.: StatPearls Publishing, 2022.
 

THE COMPARISON

A and B Axilla of a 65-year-old White man with erythrasma showing a well-demarcated erythematous plaque with fine scale (A). Wood lamp examination of the area showed characteristic bright coral red fluorescence (B).

C and D A well-demarcated, red-brown plaque with fine scale in the antecubital fossa of an obese Hispanic woman (C). Wood lamp examination revealed bright coral red fluorescence (D).

E Hypopigmented patches in the groin with pruritus in a Black man. He also had erythrasma between the toes.

Erythrasma is a skin condition caused by acute or chronic infection of the outermost layer of the epidermis (stratum corneum) with Corynebacterium minutissimum. It has a predilection for intertriginous regions such as the axillae, groin, and interdigital spaces of the toes. It can be associated with pruritus or can be asymptomatic.

Photographs courtesy of Richard P. Usatine, MD.

Epidemiology

Erythrasma typically affects adults, with greater prevalence among those residing in shared living facilities, such as dormitories or nursing homes, or in humid climates.¹ It is a common disorder with an estimated prevalence of 17.6% of bacterial skin infections in elderly patients and 44% of diabetic interdigital toe space infections.^2,3

Key clinical features

Erythrasma can manifest as red-brown hyperpigmented plaques with fine scale and little central clearing (Figures A and C) or as a hypopigmented patch (Figure E) with a sharply marginated, hyperpigmented border in patients with skin of color. In the interdigital toe spaces, the skin often is white and macerated. These findings may appear in patients of all skin tones.

Worth noting

• Corynebacterium minutissimum produces coproporphyrin III, which glows fluorescent red under Wood lamp examination (Figures B and D). A recent shower or bath may remove the fluorescent coproporphyrins and cause a false-negative result. The interdigital space between the fourth and fifth toes is a common location for C minutissimum; thus clinicians should consider examining these areas with a Wood lamp.

• Associated risk factors include obesity, immunosuppression, diabetes mellitus, and excessive sweating.¹

• The differential diagnosis includes intertrigo, inverse psoriasis, confluent and reticulated papillomatosis (Gougerot-Carteaud syndrome), acanthosis nigricans, seborrheic dermatitis, and tinea pedis when present in the interdigital toe spaces. Plaques occurring in circular patterns may be mistaken for tinea corporis or pityriasis rotunda.

• There is a high prevalence of erythrasma in patients with inverse psoriasis, and it may exacerbate psoriatic plaques.⁴

• Treatment options include application of topical clindamycin or erythromycin to the affected area.1 Some patients have responded to topical mupiricin.² For larger areas, a 1-g dose of clarithromycin⁵ or a 14-day course of erythromycin may be appropriate.1 Avoid prescribing clarithromycin to patients with preexisting heart disease due to its increased risk for cardiac events or death; consider other agents.

Health disparity highlight

Obesity, most prevalent in non-Hispanic Black adults (49.9%) and Hispanic adults (45.6%) followed by non- Hispanic White adults (41.4%),⁶ may cause velvety dark plaques on the neck called acanthosis nigricans. However, acute or chronic erythrasma also may cause hyperpigmentation of the body folds. Although the pathology of erythrasma is due to bacterial infection of the superficial layer of the stratum corneum, acanthosis nigricans is due to fibroblast proliferation and stimulation of epidermal keratinocytes likely from increased growth factors and insulinlike growth factor.⁷ If erythrasma is mistaken for acanthosis nigricans, the patient may be counseled inappropriately that the hyperpigmentation is something not easily resolved and subsequently left with an active treatable condition that adversely affects their quality of life.

THE COMPARISON

A and B Axilla of a 65-year-old White man with erythrasma showing a well-demarcated erythematous plaque with fine scale (A). Wood lamp examination of the area showed characteristic bright coral red fluorescence (B).

C and D A well-demarcated, red-brown plaque with fine scale in the antecubital fossa of an obese Hispanic woman (C). Wood lamp examination revealed bright coral red fluorescence (D).

E Hypopigmented patches in the groin with pruritus in a Black man. He also had erythrasma between the toes.

Erythrasma is a skin condition caused by acute or chronic infection of the outermost layer of the epidermis (stratum corneum) with Corynebacterium minutissimum. It has a predilection for intertriginous regions such as the axillae, groin, and interdigital spaces of the toes. It can be associated with pruritus or can be asymptomatic.

Photographs courtesy of Richard P. Usatine, MD.

Epidemiology

Erythrasma typically affects adults, with greater prevalence among those residing in shared living facilities, such as dormitories or nursing homes, or in humid climates.¹ It is a common disorder with an estimated prevalence of 17.6% of bacterial skin infections in elderly patients and 44% of diabetic interdigital toe space infections.^2,3

Key clinical features

Erythrasma can manifest as red-brown hyperpigmented plaques with fine scale and little central clearing (Figures A and C) or as a hypopigmented patch (Figure E) with a sharply marginated, hyperpigmented border in patients with skin of color. In the interdigital toe spaces, the skin often is white and macerated. These findings may appear in patients of all skin tones.

Worth noting

• Corynebacterium minutissimum produces coproporphyrin III, which glows fluorescent red under Wood lamp examination (Figures B and D). A recent shower or bath may remove the fluorescent coproporphyrins and cause a false-negative result. The interdigital space between the fourth and fifth toes is a common location for C minutissimum; thus clinicians should consider examining these areas with a Wood lamp.

• Associated risk factors include obesity, immunosuppression, diabetes mellitus, and excessive sweating.¹

• The differential diagnosis includes intertrigo, inverse psoriasis, confluent and reticulated papillomatosis (Gougerot-Carteaud syndrome), acanthosis nigricans, seborrheic dermatitis, and tinea pedis when present in the interdigital toe spaces. Plaques occurring in circular patterns may be mistaken for tinea corporis or pityriasis rotunda.

• There is a high prevalence of erythrasma in patients with inverse psoriasis, and it may exacerbate psoriatic plaques.⁴

• Treatment options include application of topical clindamycin or erythromycin to the affected area.1 Some patients have responded to topical mupiricin.² For larger areas, a 1-g dose of clarithromycin⁵ or a 14-day course of erythromycin may be appropriate.1 Avoid prescribing clarithromycin to patients with preexisting heart disease due to its increased risk for cardiac events or death; consider other agents.

Health disparity highlight

Obesity, most prevalent in non-Hispanic Black adults (49.9%) and Hispanic adults (45.6%) followed by non- Hispanic White adults (41.4%),⁶ may cause velvety dark plaques on the neck called acanthosis nigricans. However, acute or chronic erythrasma also may cause hyperpigmentation of the body folds. Although the pathology of erythrasma is due to bacterial infection of the superficial layer of the stratum corneum, acanthosis nigricans is due to fibroblast proliferation and stimulation of epidermal keratinocytes likely from increased growth factors and insulinlike growth factor.⁷ If erythrasma is mistaken for acanthosis nigricans, the patient may be counseled inappropriately that the hyperpigmentation is something not easily resolved and subsequently left with an active treatable condition that adversely affects their quality of life.

THE COMPARISON

A and B Axilla of a 65-year-old White man with erythrasma showing a well-demarcated erythematous plaque with fine scale (A). Wood lamp examination of the area showed characteristic bright coral red fluorescence (B).

C and D A well-demarcated, red-brown plaque with fine scale in the antecubital fossa of an obese Hispanic woman (C). Wood lamp examination revealed bright coral red fluorescence (D).

E Hypopigmented patches in the groin with pruritus in a Black man. He also had erythrasma between the toes.

Erythrasma is a skin condition caused by acute or chronic infection of the outermost layer of the epidermis (stratum corneum) with Corynebacterium minutissimum. It has a predilection for intertriginous regions such as the axillae, groin, and interdigital spaces of the toes. It can be associated with pruritus or can be asymptomatic.

Photographs courtesy of Richard P. Usatine, MD.

Epidemiology

Erythrasma typically affects adults, with greater prevalence among those residing in shared living facilities, such as dormitories or nursing homes, or in humid climates.¹ It is a common disorder with an estimated prevalence of 17.6% of bacterial skin infections in elderly patients and 44% of diabetic interdigital toe space infections.^2,3

Key clinical features

Erythrasma can manifest as red-brown hyperpigmented plaques with fine scale and little central clearing (Figures A and C) or as a hypopigmented patch (Figure E) with a sharply marginated, hyperpigmented border in patients with skin of color. In the interdigital toe spaces, the skin often is white and macerated. These findings may appear in patients of all skin tones.

Worth noting

• Corynebacterium minutissimum produces coproporphyrin III, which glows fluorescent red under Wood lamp examination (Figures B and D). A recent shower or bath may remove the fluorescent coproporphyrins and cause a false-negative result. The interdigital space between the fourth and fifth toes is a common location for C minutissimum; thus clinicians should consider examining these areas with a Wood lamp.

• Associated risk factors include obesity, immunosuppression, diabetes mellitus, and excessive sweating.¹

• The differential diagnosis includes intertrigo, inverse psoriasis, confluent and reticulated papillomatosis (Gougerot-Carteaud syndrome), acanthosis nigricans, seborrheic dermatitis, and tinea pedis when present in the interdigital toe spaces. Plaques occurring in circular patterns may be mistaken for tinea corporis or pityriasis rotunda.

• There is a high prevalence of erythrasma in patients with inverse psoriasis, and it may exacerbate psoriatic plaques.⁴

• Treatment options include application of topical clindamycin or erythromycin to the affected area.1 Some patients have responded to topical mupiricin.² For larger areas, a 1-g dose of clarithromycin⁵ or a 14-day course of erythromycin may be appropriate.1 Avoid prescribing clarithromycin to patients with preexisting heart disease due to its increased risk for cardiac events or death; consider other agents.

Health disparity highlight

Obesity, most prevalent in non-Hispanic Black adults (49.9%) and Hispanic adults (45.6%) followed by non- Hispanic White adults (41.4%),⁶ may cause velvety dark plaques on the neck called acanthosis nigricans. However, acute or chronic erythrasma also may cause hyperpigmentation of the body folds. Although the pathology of erythrasma is due to bacterial infection of the superficial layer of the stratum corneum, acanthosis nigricans is due to fibroblast proliferation and stimulation of epidermal keratinocytes likely from increased growth factors and insulinlike growth factor.⁷ If erythrasma is mistaken for acanthosis nigricans, the patient may be counseled inappropriately that the hyperpigmentation is something not easily resolved and subsequently left with an active treatable condition that adversely affects their quality of life.

Respiratory syncytial virus (RSV) and influenza cases are surging to record numbers this winter in the wake of the COVID-19 pandemic when children were sheltering in the home, receiving virtual education, masking, and hand sanitizing, and when other precautionary health measures were in place.

RSV and flu illness in children now have hospital emergency rooms and pediatric ICUs and wards over capacity. As these respiratory infections increase and variants of SARS-CoV-2 come to dominate, we may expect the full impact of a tripledemic (RSV + flu + SARS-CoV-2).

It has been estimated that RSV causes 33 million lower respiratory infections and 3.6 million hospitalizations annually worldwide in children younger than 5 years old (Lancet. 2022 May 19. doi: 10.1016/S0140-6736(22)00478-0). RSV is typically a seasonal respiratory infection occurring in late fall through early winter, when it gives way to dominance by flu. Thus, we have experienced an out-of-season surge in RSV since it began in early fall 2022, and it persists. A likely explanation for the early and persisting surge in RSV is immunity debt (Infect Dis Now. 2021 Aug. doi: 10.1016/j.idnow.2021.05.004).

Immunity debt is an unintended consequence of prevention of infections that occurred because of public health measures to prevent spread of SARS-CoV-2 infections. The COVID-19 lockdown undoubtedly saved many lives. However, while we were sheltering from SARS-CoV-2 infections, we also were avoiding other infections, especially other respiratory infections such as RSV and flu.

Our group studied this in community-based pediatric practices in Rochester, N.Y. Physician-diagnosed, medically attended infectious disease illness visits were assessed in two child cohorts, age 6-36 months from March 15 to Dec. 31, 2020 (the pandemic period), compared with the same months in 2019 (prepandemic). One hundred forty-four children were included in the pandemic cohort and 215 in the prepandemic cohort. Visits for bronchiolitis were 7.4-fold lower (P = .04), acute otitis media 3.7-fold lower (P < .0001), viral upper respiratory infections (URI) 3.8-fold lower (P < .0001), and croup 27.5-fold lower (P < .0001) in the pandemic than the prepandemic cohort (Front Pediatr. 2021 Sep 13. doi: 10.3389/fped.2021.72248).

The significant reduction in respiratory illness during the COVID-19 epidemic we and others observed resulted in a large pool of children who did not experience RSV or flu infections for an entire year or more. Herd immunity dropped. The susceptible child population increased, including children older than typically seen. We had an immunity debt that had to be repaid, and the repayment is occurring now.

As a consequence of the surge in RSV, interest in prevention has gained more attention. In 1966, tragically, two infant deaths and hospitalization of 80% of the participating infants occurred during a clinical trial of an experimental candidate RSV vaccine, which contained an inactivated version of the entire virus. The severe side effect was later found to be caused by both an antibody and a T-cell problem. The antibody produced in response to the inactivated whole virus didn’t have very good functional activity at blocking or neutralizing the virus. That led to deposition of immune complexes and activation of complement that damaged the airways. The vaccine also triggered a T-cell response with inflammatory cytokine release that added to airway obstruction and lack of clearance of the virus. RSV vaccine development was halted and the bar for further studies was raised very high to ensure safety of any future RSV vaccines. Now, 55 years later, two RSV vaccines and a new preventive monoclonal antibody are nearing licensure.

GlaxoSmithKline (GSK) and Pfizer are in phase 3 clinical trials of a safer RSV vaccine that contains only the RSV surface protein known as protein F. Protein F changes its structure when the virus infects and fuses with human respiratory epithelial cells. The GSK and Pfizer vaccines use a molecular strategy developed at the National Institutes of Health to lock protein F into its original, prefusion configuration. A similar strategy was used by Pfizer/BioNTech and Moderna in their design of mRNA vaccines to the SARS-CoV-2 spike surface protein.

A vaccine with the F protein in its prefusion form takes care of the antibody problem that caused the severe side-effects from the 1966 version of inactivated whole virus vaccine because it induces very high-efficiency, high-potency antibodies that neutralize the RSV. The T-cell response is not as well understood and that is why studies are being done in adults first and then moving to young infants.

The new RSV vaccines are being developed for use in adults over age 60, adults with comorbidities, maternal immunization, and infants. Encouraging results were recently reported by GSK and Pfizer from adult trials. In an interim analysis, Pfizer also recently reported that maternal immunization in the late second or third trimester with their vaccine had an efficacy of 82% within a newborn’s first 90 days of life against severe lower respiratory tract illness. At age 6 months, the efficacy was sustained at 69%. So far, both the GSK and Pfizer RSV vaccines have shown a favorable safety profile.

Another strategy in the RSV prevention field has been a monoclonal antibody. Palivizumab (Synagis, AstraZeneca) is used to prevent severe RSV infections in prematurely born and other infants who are at higher risk of mortality and severe morbidity. Soon there will likely be another monoclonal antibody, called nirsevimab (Beyfortus, AstraZeneca and Sanofi). It is approved in Europe but not yet approved in the United States as I prepare this column. Nirsevimab may be even better than palivizumab – based on phase 3 trial data – and a single injection lasts through an entire normal RSV season while palivizumab requires monthly injections.

Similar to the situation with RSV, the flu season started earlier than usual in fall 2022 and has been picking up steam, likely also because of immunity debt. The WHO estimates that annual epidemics of influenza cause 1 billion infections, 3 million to 5 million severe cases, and 300,000-500,000 deaths. Seasonal flu vaccines provide modest protection. Current flu vaccine formulations consist of the hemagglutinin (H) and neuraminidase (N) proteins but those proteins change sufficiently (called antigenic drift) such that production of the vaccines based on a best guess each year often is not correct for the influenza A or influenza B strains that circulate in a given year (antigenic mismatch).

Public health authorities have long worried about a major change in the composition of the H and N proteins of the influenza virus (called antigenic shift). Preparedness and response to the COVID-19 pandemic was based on preparedness and response to an anticipated influenza pandemic similar to the 1918 flu pandemic. For flu, new “universal” vaccines are in development. Among the candidate vaccines are mRNA vaccines, building on the success of the SARS-CoV-2 mRNA vaccines (Science. 2022 Nov 24. doi: 10.1126/science.abm0271).
 

Dr. Pichichero is a specialist in pediatric infectious diseases, Center for Infectious Diseases and Immunology, and director of the Research Institute, at Rochester (N.Y.) General Hospital. He has no conflicts of interest to declare.

Respiratory syncytial virus (RSV) and influenza cases are surging to record numbers this winter in the wake of the COVID-19 pandemic when children were sheltering in the home, receiving virtual education, masking, and hand sanitizing, and when other precautionary health measures were in place.

RSV and flu illness in children now have hospital emergency rooms and pediatric ICUs and wards over capacity. As these respiratory infections increase and variants of SARS-CoV-2 come to dominate, we may expect the full impact of a tripledemic (RSV + flu + SARS-CoV-2).

It has been estimated that RSV causes 33 million lower respiratory infections and 3.6 million hospitalizations annually worldwide in children younger than 5 years old (Lancet. 2022 May 19. doi: 10.1016/S0140-6736(22)00478-0). RSV is typically a seasonal respiratory infection occurring in late fall through early winter, when it gives way to dominance by flu. Thus, we have experienced an out-of-season surge in RSV since it began in early fall 2022, and it persists. A likely explanation for the early and persisting surge in RSV is immunity debt (Infect Dis Now. 2021 Aug. doi: 10.1016/j.idnow.2021.05.004).

Immunity debt is an unintended consequence of prevention of infections that occurred because of public health measures to prevent spread of SARS-CoV-2 infections. The COVID-19 lockdown undoubtedly saved many lives. However, while we were sheltering from SARS-CoV-2 infections, we also were avoiding other infections, especially other respiratory infections such as RSV and flu.

Our group studied this in community-based pediatric practices in Rochester, N.Y. Physician-diagnosed, medically attended infectious disease illness visits were assessed in two child cohorts, age 6-36 months from March 15 to Dec. 31, 2020 (the pandemic period), compared with the same months in 2019 (prepandemic). One hundred forty-four children were included in the pandemic cohort and 215 in the prepandemic cohort. Visits for bronchiolitis were 7.4-fold lower (P = .04), acute otitis media 3.7-fold lower (P < .0001), viral upper respiratory infections (URI) 3.8-fold lower (P < .0001), and croup 27.5-fold lower (P < .0001) in the pandemic than the prepandemic cohort (Front Pediatr. 2021 Sep 13. doi: 10.3389/fped.2021.72248).

The significant reduction in respiratory illness during the COVID-19 epidemic we and others observed resulted in a large pool of children who did not experience RSV or flu infections for an entire year or more. Herd immunity dropped. The susceptible child population increased, including children older than typically seen. We had an immunity debt that had to be repaid, and the repayment is occurring now.

As a consequence of the surge in RSV, interest in prevention has gained more attention. In 1966, tragically, two infant deaths and hospitalization of 80% of the participating infants occurred during a clinical trial of an experimental candidate RSV vaccine, which contained an inactivated version of the entire virus. The severe side effect was later found to be caused by both an antibody and a T-cell problem. The antibody produced in response to the inactivated whole virus didn’t have very good functional activity at blocking or neutralizing the virus. That led to deposition of immune complexes and activation of complement that damaged the airways. The vaccine also triggered a T-cell response with inflammatory cytokine release that added to airway obstruction and lack of clearance of the virus. RSV vaccine development was halted and the bar for further studies was raised very high to ensure safety of any future RSV vaccines. Now, 55 years later, two RSV vaccines and a new preventive monoclonal antibody are nearing licensure.

GlaxoSmithKline (GSK) and Pfizer are in phase 3 clinical trials of a safer RSV vaccine that contains only the RSV surface protein known as protein F. Protein F changes its structure when the virus infects and fuses with human respiratory epithelial cells. The GSK and Pfizer vaccines use a molecular strategy developed at the National Institutes of Health to lock protein F into its original, prefusion configuration. A similar strategy was used by Pfizer/BioNTech and Moderna in their design of mRNA vaccines to the SARS-CoV-2 spike surface protein.

A vaccine with the F protein in its prefusion form takes care of the antibody problem that caused the severe side-effects from the 1966 version of inactivated whole virus vaccine because it induces very high-efficiency, high-potency antibodies that neutralize the RSV. The T-cell response is not as well understood and that is why studies are being done in adults first and then moving to young infants.

The new RSV vaccines are being developed for use in adults over age 60, adults with comorbidities, maternal immunization, and infants. Encouraging results were recently reported by GSK and Pfizer from adult trials. In an interim analysis, Pfizer also recently reported that maternal immunization in the late second or third trimester with their vaccine had an efficacy of 82% within a newborn’s first 90 days of life against severe lower respiratory tract illness. At age 6 months, the efficacy was sustained at 69%. So far, both the GSK and Pfizer RSV vaccines have shown a favorable safety profile.

Another strategy in the RSV prevention field has been a monoclonal antibody. Palivizumab (Synagis, AstraZeneca) is used to prevent severe RSV infections in prematurely born and other infants who are at higher risk of mortality and severe morbidity. Soon there will likely be another monoclonal antibody, called nirsevimab (Beyfortus, AstraZeneca and Sanofi). It is approved in Europe but not yet approved in the United States as I prepare this column. Nirsevimab may be even better than palivizumab – based on phase 3 trial data – and a single injection lasts through an entire normal RSV season while palivizumab requires monthly injections.

Similar to the situation with RSV, the flu season started earlier than usual in fall 2022 and has been picking up steam, likely also because of immunity debt. The WHO estimates that annual epidemics of influenza cause 1 billion infections, 3 million to 5 million severe cases, and 300,000-500,000 deaths. Seasonal flu vaccines provide modest protection. Current flu vaccine formulations consist of the hemagglutinin (H) and neuraminidase (N) proteins but those proteins change sufficiently (called antigenic drift) such that production of the vaccines based on a best guess each year often is not correct for the influenza A or influenza B strains that circulate in a given year (antigenic mismatch).

Public health authorities have long worried about a major change in the composition of the H and N proteins of the influenza virus (called antigenic shift). Preparedness and response to the COVID-19 pandemic was based on preparedness and response to an anticipated influenza pandemic similar to the 1918 flu pandemic. For flu, new “universal” vaccines are in development. Among the candidate vaccines are mRNA vaccines, building on the success of the SARS-CoV-2 mRNA vaccines (Science. 2022 Nov 24. doi: 10.1126/science.abm0271).
 

Dr. Pichichero is a specialist in pediatric infectious diseases, Center for Infectious Diseases and Immunology, and director of the Research Institute, at Rochester (N.Y.) General Hospital. He has no conflicts of interest to declare.

Respiratory syncytial virus (RSV) and influenza cases are surging to record numbers this winter in the wake of the COVID-19 pandemic when children were sheltering in the home, receiving virtual education, masking, and hand sanitizing, and when other precautionary health measures were in place.

RSV and flu illness in children now have hospital emergency rooms and pediatric ICUs and wards over capacity. As these respiratory infections increase and variants of SARS-CoV-2 come to dominate, we may expect the full impact of a tripledemic (RSV + flu + SARS-CoV-2).

It has been estimated that RSV causes 33 million lower respiratory infections and 3.6 million hospitalizations annually worldwide in children younger than 5 years old (Lancet. 2022 May 19. doi: 10.1016/S0140-6736(22)00478-0). RSV is typically a seasonal respiratory infection occurring in late fall through early winter, when it gives way to dominance by flu. Thus, we have experienced an out-of-season surge in RSV since it began in early fall 2022, and it persists. A likely explanation for the early and persisting surge in RSV is immunity debt (Infect Dis Now. 2021 Aug. doi: 10.1016/j.idnow.2021.05.004).

Immunity debt is an unintended consequence of prevention of infections that occurred because of public health measures to prevent spread of SARS-CoV-2 infections. The COVID-19 lockdown undoubtedly saved many lives. However, while we were sheltering from SARS-CoV-2 infections, we also were avoiding other infections, especially other respiratory infections such as RSV and flu.

Our group studied this in community-based pediatric practices in Rochester, N.Y. Physician-diagnosed, medically attended infectious disease illness visits were assessed in two child cohorts, age 6-36 months from March 15 to Dec. 31, 2020 (the pandemic period), compared with the same months in 2019 (prepandemic). One hundred forty-four children were included in the pandemic cohort and 215 in the prepandemic cohort. Visits for bronchiolitis were 7.4-fold lower (P = .04), acute otitis media 3.7-fold lower (P < .0001), viral upper respiratory infections (URI) 3.8-fold lower (P < .0001), and croup 27.5-fold lower (P < .0001) in the pandemic than the prepandemic cohort (Front Pediatr. 2021 Sep 13. doi: 10.3389/fped.2021.72248).

The significant reduction in respiratory illness during the COVID-19 epidemic we and others observed resulted in a large pool of children who did not experience RSV or flu infections for an entire year or more. Herd immunity dropped. The susceptible child population increased, including children older than typically seen. We had an immunity debt that had to be repaid, and the repayment is occurring now.

As a consequence of the surge in RSV, interest in prevention has gained more attention. In 1966, tragically, two infant deaths and hospitalization of 80% of the participating infants occurred during a clinical trial of an experimental candidate RSV vaccine, which contained an inactivated version of the entire virus. The severe side effect was later found to be caused by both an antibody and a T-cell problem. The antibody produced in response to the inactivated whole virus didn’t have very good functional activity at blocking or neutralizing the virus. That led to deposition of immune complexes and activation of complement that damaged the airways. The vaccine also triggered a T-cell response with inflammatory cytokine release that added to airway obstruction and lack of clearance of the virus. RSV vaccine development was halted and the bar for further studies was raised very high to ensure safety of any future RSV vaccines. Now, 55 years later, two RSV vaccines and a new preventive monoclonal antibody are nearing licensure.

GlaxoSmithKline (GSK) and Pfizer are in phase 3 clinical trials of a safer RSV vaccine that contains only the RSV surface protein known as protein F. Protein F changes its structure when the virus infects and fuses with human respiratory epithelial cells. The GSK and Pfizer vaccines use a molecular strategy developed at the National Institutes of Health to lock protein F into its original, prefusion configuration. A similar strategy was used by Pfizer/BioNTech and Moderna in their design of mRNA vaccines to the SARS-CoV-2 spike surface protein.

A vaccine with the F protein in its prefusion form takes care of the antibody problem that caused the severe side-effects from the 1966 version of inactivated whole virus vaccine because it induces very high-efficiency, high-potency antibodies that neutralize the RSV. The T-cell response is not as well understood and that is why studies are being done in adults first and then moving to young infants.

The new RSV vaccines are being developed for use in adults over age 60, adults with comorbidities, maternal immunization, and infants. Encouraging results were recently reported by GSK and Pfizer from adult trials. In an interim analysis, Pfizer also recently reported that maternal immunization in the late second or third trimester with their vaccine had an efficacy of 82% within a newborn’s first 90 days of life against severe lower respiratory tract illness. At age 6 months, the efficacy was sustained at 69%. So far, both the GSK and Pfizer RSV vaccines have shown a favorable safety profile.

Another strategy in the RSV prevention field has been a monoclonal antibody. Palivizumab (Synagis, AstraZeneca) is used to prevent severe RSV infections in prematurely born and other infants who are at higher risk of mortality and severe morbidity. Soon there will likely be another monoclonal antibody, called nirsevimab (Beyfortus, AstraZeneca and Sanofi). It is approved in Europe but not yet approved in the United States as I prepare this column. Nirsevimab may be even better than palivizumab – based on phase 3 trial data – and a single injection lasts through an entire normal RSV season while palivizumab requires monthly injections.

Similar to the situation with RSV, the flu season started earlier than usual in fall 2022 and has been picking up steam, likely also because of immunity debt. The WHO estimates that annual epidemics of influenza cause 1 billion infections, 3 million to 5 million severe cases, and 300,000-500,000 deaths. Seasonal flu vaccines provide modest protection. Current flu vaccine formulations consist of the hemagglutinin (H) and neuraminidase (N) proteins but those proteins change sufficiently (called antigenic drift) such that production of the vaccines based on a best guess each year often is not correct for the influenza A or influenza B strains that circulate in a given year (antigenic mismatch).

Public health authorities have long worried about a major change in the composition of the H and N proteins of the influenza virus (called antigenic shift). Preparedness and response to the COVID-19 pandemic was based on preparedness and response to an anticipated influenza pandemic similar to the 1918 flu pandemic. For flu, new “universal” vaccines are in development. Among the candidate vaccines are mRNA vaccines, building on the success of the SARS-CoV-2 mRNA vaccines (Science. 2022 Nov 24. doi: 10.1126/science.abm0271).
 

Dr. Pichichero is a specialist in pediatric infectious diseases, Center for Infectious Diseases and Immunology, and director of the Research Institute, at Rochester (N.Y.) General Hospital. He has no conflicts of interest to declare.

New cases of COVID-19 in children largely held steady over the Thanksgiving holiday, but hospital admissions are telling a somewhat different story.

New pediatric COVID cases for the week ending on Thanksgiving (11/18-11/24) were up by 5.3% over the previous week, but in the most recent week (11/25-12/1) new cases dropped by 2.6%, according to state data collected by the American Academy of Pediatrics and the Children’s Hospital Association.

In both weeks, though, the total case count stayed below 30,000 – a streak that has now lasted 8 weeks – so the actual number of weekly cases remained fairly low, the AAP/CHA weekly report indicates.

The nation’s emergency departments also experienced a small Thanksgiving bump, as the proportion of visits with diagnosed COVID went from 1.0% of all ED visits for children aged 0-11 years on Nov. 14 to 2.0% on Nov. 27, just 3 days after the official holiday, based on data from the Centers for Disease Control and Prevention. The rate was down to 1.5% on Dec. 1, and similar patterns can be seen for children aged 12-15 and 16-17 years.

New hospital admissions, on the other hand, seem to be following a different path, at least according to the CDC. The hospitalization rate for children aged 0-17 years bottomed out at 0.16 new admissions per 100,000 population back on Oct. 21 and has climbed fairly steadily since then. It was up to 0.20 per 100,000 by Nov. 14, had reached 0.22 per 100,000 on Thanksgiving day (11/24), and then continued to 0.26 per 100,000 by Dec. 2, the latest date for which CDC data are available.

The hospitalization story, however, offers yet another twist. The New York Times, using data from the U.S. Department of Health & Human Services, reports that new COVID-related admissions have held steady at 1.0 per 100,000 since Nov. 18. The rate is much higher than has been reported by the CDC, but no increase can be seen in recent weeks among children, which is not the case for Americans overall, Medscape recently reported.

New cases of COVID-19 in children largely held steady over the Thanksgiving holiday, but hospital admissions are telling a somewhat different story.

New pediatric COVID cases for the week ending on Thanksgiving (11/18-11/24) were up by 5.3% over the previous week, but in the most recent week (11/25-12/1) new cases dropped by 2.6%, according to state data collected by the American Academy of Pediatrics and the Children’s Hospital Association.

In both weeks, though, the total case count stayed below 30,000 – a streak that has now lasted 8 weeks – so the actual number of weekly cases remained fairly low, the AAP/CHA weekly report indicates.

The nation’s emergency departments also experienced a small Thanksgiving bump, as the proportion of visits with diagnosed COVID went from 1.0% of all ED visits for children aged 0-11 years on Nov. 14 to 2.0% on Nov. 27, just 3 days after the official holiday, based on data from the Centers for Disease Control and Prevention. The rate was down to 1.5% on Dec. 1, and similar patterns can be seen for children aged 12-15 and 16-17 years.

New hospital admissions, on the other hand, seem to be following a different path, at least according to the CDC. The hospitalization rate for children aged 0-17 years bottomed out at 0.16 new admissions per 100,000 population back on Oct. 21 and has climbed fairly steadily since then. It was up to 0.20 per 100,000 by Nov. 14, had reached 0.22 per 100,000 on Thanksgiving day (11/24), and then continued to 0.26 per 100,000 by Dec. 2, the latest date for which CDC data are available.

The hospitalization story, however, offers yet another twist. The New York Times, using data from the U.S. Department of Health & Human Services, reports that new COVID-related admissions have held steady at 1.0 per 100,000 since Nov. 18. The rate is much higher than has been reported by the CDC, but no increase can be seen in recent weeks among children, which is not the case for Americans overall, Medscape recently reported.

New cases of COVID-19 in children largely held steady over the Thanksgiving holiday, but hospital admissions are telling a somewhat different story.

New pediatric COVID cases for the week ending on Thanksgiving (11/18-11/24) were up by 5.3% over the previous week, but in the most recent week (11/25-12/1) new cases dropped by 2.6%, according to state data collected by the American Academy of Pediatrics and the Children’s Hospital Association.

In both weeks, though, the total case count stayed below 30,000 – a streak that has now lasted 8 weeks – so the actual number of weekly cases remained fairly low, the AAP/CHA weekly report indicates.

The nation’s emergency departments also experienced a small Thanksgiving bump, as the proportion of visits with diagnosed COVID went from 1.0% of all ED visits for children aged 0-11 years on Nov. 14 to 2.0% on Nov. 27, just 3 days after the official holiday, based on data from the Centers for Disease Control and Prevention. The rate was down to 1.5% on Dec. 1, and similar patterns can be seen for children aged 12-15 and 16-17 years.

New hospital admissions, on the other hand, seem to be following a different path, at least according to the CDC. The hospitalization rate for children aged 0-17 years bottomed out at 0.16 new admissions per 100,000 population back on Oct. 21 and has climbed fairly steadily since then. It was up to 0.20 per 100,000 by Nov. 14, had reached 0.22 per 100,000 on Thanksgiving day (11/24), and then continued to 0.26 per 100,000 by Dec. 2, the latest date for which CDC data are available.

The hospitalization story, however, offers yet another twist. The New York Times, using data from the U.S. Department of Health & Human Services, reports that new COVID-related admissions have held steady at 1.0 per 100,000 since Nov. 18. The rate is much higher than has been reported by the CDC, but no increase can be seen in recent weeks among children, which is not the case for Americans overall, Medscape recently reported.

A randomized trial indicating that surgical masks are not inferior to N95 masks in protecting health care workers against COVID-19 has sparked international criticism.

The study’s senior author is John Conly, MD, an infectious disease specialist and professor at the University of Calgary (Alta.), and Alberta Health Services. The findings are not consistent with those of many other studies on this topic.

Commenting about Dr. Conly’s study, Eric Topol, MD, editor-in-chief of Medscape, wrote: “It’s woefully underpowered but ruled out a doubling of hazard for use of medical masks.”

The study, which was partially funded by the World Health Organization, was published online in Annals of Internal Medicine.

This is not the first time that Dr. Conly, who also advises the WHO, has been the subject of controversy. He previously denied that COVID-19 is airborne – a position that is contradicted by strong evidence. In 2021, Dr. Conly made headlines with his controversial claim that N95 respirators can cause harms, including oxygen depletion and carbon dioxide retention.

A detailed examination by the Center for Infectious Disease Research and Policy (CIDRAP) at the University of Minnesota, Minneapolis, pointed out numerous scientific flaws in the study, including inconsistent use of both types of masks. The study also examined health care workers in four very different countries (Canada, Israel, Egypt, and Pakistan) during different periods of the pandemic, which may have affected the results. Furthermore, the study did not account for vaccination status and lacked a control group. CIDRAP receives funding from 3M, which makes N95 respirators.

In a commentary published alongside the study, Roger Chou, MD, professor of medicine at Oregon Health & Science University, Portland, said that the results were “not definitive,” with “a generous noninferiority threshold” that is actually “consistent with up to a relative 70% increased risk ... which may be unacceptable to many health workers.”

Lead study author Mark Loeb, MD, professor of infectious diseases at McMaster University, Hamilton, Ont., defended the findings. “The confidence intervals around this, that is, what the possible results could be if the trial was repeated many times, range from −2.5% to 4.9%,” he told this news organization. “This means that the risk of a COVID-19 infection in those using the medical masks could have ranged from anywhere from 2.5% reduction in risk to a 4.9% increase in risk. Readers and policy makers can decide for themselves about this.”

“There is no point continuing to run underpowered, poorly designed studies that are designed to confirm existing biases,” Raina MacIntyre, PhD, professor of global biosecurity and head of the Biosecurity Program at the Kirby Institute, Sydney, said in an interview. “The new study in Annals of Internal Medicine is entirely consistent with our finding that to prevent infection, you need an N95, and it needs to be worn throughout the whole shift. A surgical mask and intermittent use of N95 are equally ineffective. This should not surprise anyone, given a surgical mask is not designed as respiratory protection but is designed to prevent splash or spray of liquid on the face. Only a respirator is designed as respiratory protection through both the seal around the face and the filter of the face piece to prevent inhalation of virus laden aerosols, but you need to wear it continually in a high-risk environment like a hospital.”

“It makes zero sense to do a randomized trial on something you can measure directly,” said Kimberly Prather, PhD, an atmospheric chemist, professor, and director of the NSF Center for Aerosol Impacts on Chemistry of the Environment at the University of California, San Diego. “In fact, many studies have shown aerosols leaking out of surgical masks. Surgical masks are designed to block large spray droplets. Aerosols (0.5-3 mcm), which have been shown to contain infectious SARS-CoV-2 virus, travel with the air flow, and escape.”

“This study ... will be used to justify policies of supplying health care workers, and perhaps patients and visitors, too, with inadequate protection,” Trish Greenhalgh, MD, professor of primary care health sciences at the University of Oxford (England), told this news organization.

“These authors have been pushing back against treating COVID as airborne for 3 years,” David Fisman, MD, an epidemiologist and infectious disease specialist at the University of Toronto, said in an interview. “So, you’ll see these folks brandishing this very flawed trial to justify continuing the infection control practices that have been so disastrous throughout the pandemic.”

The study was funded by the World Health Organization, the Canadian Institutes of Health Research, and the Juravinski Research Institute. Dr. Conly reported receiving grants from the Canadian Institutes for Health Research, Pfizer, and the WHO. Dr. Chou disclosed being a methodologist for WHO guidelines on infection prevention and control measures for COVID-19. Dr. Loeb disclosed payment for expert testimony on personal protective equipment from the government of Manitoba and the Peel District School Board. Dr. MacIntyre has led a large body of research on masks and respirators in health workers, including four randomized clinical trials. She is the author of a book, “Dark Winter: An insider’s guide to pandemics and biosecurity” (Syndey: NewSouth Publishing, 2022), which covers the history and politics of the controversies around N95 and masks. Dr. Prather reported no disclosures. Dr. Greenhalgh is a member of Independent SAGE and an unpaid adviser to the philanthropic fund Balvi. Dr. Fisman has served as a paid legal expert for the Ontario Nurses’ Association in their challenge to Directive 5, which restricted access to N95 masks in health care. He also served as a paid legal expert for the Elementary Teachers’ Federation of Ontario in its efforts to make schools safer in Ontario.

A version of this article first appeared on Medscape.com.

A randomized trial indicating that surgical masks are not inferior to N95 masks in protecting health care workers against COVID-19 has sparked international criticism.

The study’s senior author is John Conly, MD, an infectious disease specialist and professor at the University of Calgary (Alta.), and Alberta Health Services. The findings are not consistent with those of many other studies on this topic.

Commenting about Dr. Conly’s study, Eric Topol, MD, editor-in-chief of Medscape, wrote: “It’s woefully underpowered but ruled out a doubling of hazard for use of medical masks.”

The study, which was partially funded by the World Health Organization, was published online in Annals of Internal Medicine.

This is not the first time that Dr. Conly, who also advises the WHO, has been the subject of controversy. He previously denied that COVID-19 is airborne – a position that is contradicted by strong evidence. In 2021, Dr. Conly made headlines with his controversial claim that N95 respirators can cause harms, including oxygen depletion and carbon dioxide retention.

A detailed examination by the Center for Infectious Disease Research and Policy (CIDRAP) at the University of Minnesota, Minneapolis, pointed out numerous scientific flaws in the study, including inconsistent use of both types of masks. The study also examined health care workers in four very different countries (Canada, Israel, Egypt, and Pakistan) during different periods of the pandemic, which may have affected the results. Furthermore, the study did not account for vaccination status and lacked a control group. CIDRAP receives funding from 3M, which makes N95 respirators.

In a commentary published alongside the study, Roger Chou, MD, professor of medicine at Oregon Health & Science University, Portland, said that the results were “not definitive,” with “a generous noninferiority threshold” that is actually “consistent with up to a relative 70% increased risk ... which may be unacceptable to many health workers.”

Lead study author Mark Loeb, MD, professor of infectious diseases at McMaster University, Hamilton, Ont., defended the findings. “The confidence intervals around this, that is, what the possible results could be if the trial was repeated many times, range from −2.5% to 4.9%,” he told this news organization. “This means that the risk of a COVID-19 infection in those using the medical masks could have ranged from anywhere from 2.5% reduction in risk to a 4.9% increase in risk. Readers and policy makers can decide for themselves about this.”

“There is no point continuing to run underpowered, poorly designed studies that are designed to confirm existing biases,” Raina MacIntyre, PhD, professor of global biosecurity and head of the Biosecurity Program at the Kirby Institute, Sydney, said in an interview. “The new study in Annals of Internal Medicine is entirely consistent with our finding that to prevent infection, you need an N95, and it needs to be worn throughout the whole shift. A surgical mask and intermittent use of N95 are equally ineffective. This should not surprise anyone, given a surgical mask is not designed as respiratory protection but is designed to prevent splash or spray of liquid on the face. Only a respirator is designed as respiratory protection through both the seal around the face and the filter of the face piece to prevent inhalation of virus laden aerosols, but you need to wear it continually in a high-risk environment like a hospital.”

“It makes zero sense to do a randomized trial on something you can measure directly,” said Kimberly Prather, PhD, an atmospheric chemist, professor, and director of the NSF Center for Aerosol Impacts on Chemistry of the Environment at the University of California, San Diego. “In fact, many studies have shown aerosols leaking out of surgical masks. Surgical masks are designed to block large spray droplets. Aerosols (0.5-3 mcm), which have been shown to contain infectious SARS-CoV-2 virus, travel with the air flow, and escape.”

“This study ... will be used to justify policies of supplying health care workers, and perhaps patients and visitors, too, with inadequate protection,” Trish Greenhalgh, MD, professor of primary care health sciences at the University of Oxford (England), told this news organization.

“These authors have been pushing back against treating COVID as airborne for 3 years,” David Fisman, MD, an epidemiologist and infectious disease specialist at the University of Toronto, said in an interview. “So, you’ll see these folks brandishing this very flawed trial to justify continuing the infection control practices that have been so disastrous throughout the pandemic.”

The study was funded by the World Health Organization, the Canadian Institutes of Health Research, and the Juravinski Research Institute. Dr. Conly reported receiving grants from the Canadian Institutes for Health Research, Pfizer, and the WHO. Dr. Chou disclosed being a methodologist for WHO guidelines on infection prevention and control measures for COVID-19. Dr. Loeb disclosed payment for expert testimony on personal protective equipment from the government of Manitoba and the Peel District School Board. Dr. MacIntyre has led a large body of research on masks and respirators in health workers, including four randomized clinical trials. She is the author of a book, “Dark Winter: An insider’s guide to pandemics and biosecurity” (Syndey: NewSouth Publishing, 2022), which covers the history and politics of the controversies around N95 and masks. Dr. Prather reported no disclosures. Dr. Greenhalgh is a member of Independent SAGE and an unpaid adviser to the philanthropic fund Balvi. Dr. Fisman has served as a paid legal expert for the Ontario Nurses’ Association in their challenge to Directive 5, which restricted access to N95 masks in health care. He also served as a paid legal expert for the Elementary Teachers’ Federation of Ontario in its efforts to make schools safer in Ontario.

A version of this article first appeared on Medscape.com.

A randomized trial indicating that surgical masks are not inferior to N95 masks in protecting health care workers against COVID-19 has sparked international criticism.

The study’s senior author is John Conly, MD, an infectious disease specialist and professor at the University of Calgary (Alta.), and Alberta Health Services. The findings are not consistent with those of many other studies on this topic.

Commenting about Dr. Conly’s study, Eric Topol, MD, editor-in-chief of Medscape, wrote: “It’s woefully underpowered but ruled out a doubling of hazard for use of medical masks.”

The study, which was partially funded by the World Health Organization, was published online in Annals of Internal Medicine.

This is not the first time that Dr. Conly, who also advises the WHO, has been the subject of controversy. He previously denied that COVID-19 is airborne – a position that is contradicted by strong evidence. In 2021, Dr. Conly made headlines with his controversial claim that N95 respirators can cause harms, including oxygen depletion and carbon dioxide retention.

A detailed examination by the Center for Infectious Disease Research and Policy (CIDRAP) at the University of Minnesota, Minneapolis, pointed out numerous scientific flaws in the study, including inconsistent use of both types of masks. The study also examined health care workers in four very different countries (Canada, Israel, Egypt, and Pakistan) during different periods of the pandemic, which may have affected the results. Furthermore, the study did not account for vaccination status and lacked a control group. CIDRAP receives funding from 3M, which makes N95 respirators.

In a commentary published alongside the study, Roger Chou, MD, professor of medicine at Oregon Health & Science University, Portland, said that the results were “not definitive,” with “a generous noninferiority threshold” that is actually “consistent with up to a relative 70% increased risk ... which may be unacceptable to many health workers.”

Lead study author Mark Loeb, MD, professor of infectious diseases at McMaster University, Hamilton, Ont., defended the findings. “The confidence intervals around this, that is, what the possible results could be if the trial was repeated many times, range from −2.5% to 4.9%,” he told this news organization. “This means that the risk of a COVID-19 infection in those using the medical masks could have ranged from anywhere from 2.5% reduction in risk to a 4.9% increase in risk. Readers and policy makers can decide for themselves about this.”

“There is no point continuing to run underpowered, poorly designed studies that are designed to confirm existing biases,” Raina MacIntyre, PhD, professor of global biosecurity and head of the Biosecurity Program at the Kirby Institute, Sydney, said in an interview. “The new study in Annals of Internal Medicine is entirely consistent with our finding that to prevent infection, you need an N95, and it needs to be worn throughout the whole shift. A surgical mask and intermittent use of N95 are equally ineffective. This should not surprise anyone, given a surgical mask is not designed as respiratory protection but is designed to prevent splash or spray of liquid on the face. Only a respirator is designed as respiratory protection through both the seal around the face and the filter of the face piece to prevent inhalation of virus laden aerosols, but you need to wear it continually in a high-risk environment like a hospital.”

“It makes zero sense to do a randomized trial on something you can measure directly,” said Kimberly Prather, PhD, an atmospheric chemist, professor, and director of the NSF Center for Aerosol Impacts on Chemistry of the Environment at the University of California, San Diego. “In fact, many studies have shown aerosols leaking out of surgical masks. Surgical masks are designed to block large spray droplets. Aerosols (0.5-3 mcm), which have been shown to contain infectious SARS-CoV-2 virus, travel with the air flow, and escape.”

“This study ... will be used to justify policies of supplying health care workers, and perhaps patients and visitors, too, with inadequate protection,” Trish Greenhalgh, MD, professor of primary care health sciences at the University of Oxford (England), told this news organization.

“These authors have been pushing back against treating COVID as airborne for 3 years,” David Fisman, MD, an epidemiologist and infectious disease specialist at the University of Toronto, said in an interview. “So, you’ll see these folks brandishing this very flawed trial to justify continuing the infection control practices that have been so disastrous throughout the pandemic.”

The study was funded by the World Health Organization, the Canadian Institutes of Health Research, and the Juravinski Research Institute. Dr. Conly reported receiving grants from the Canadian Institutes for Health Research, Pfizer, and the WHO. Dr. Chou disclosed being a methodologist for WHO guidelines on infection prevention and control measures for COVID-19. Dr. Loeb disclosed payment for expert testimony on personal protective equipment from the government of Manitoba and the Peel District School Board. Dr. MacIntyre has led a large body of research on masks and respirators in health workers, including four randomized clinical trials. She is the author of a book, “Dark Winter: An insider’s guide to pandemics and biosecurity” (Syndey: NewSouth Publishing, 2022), which covers the history and politics of the controversies around N95 and masks. Dr. Prather reported no disclosures. Dr. Greenhalgh is a member of Independent SAGE and an unpaid adviser to the philanthropic fund Balvi. Dr. Fisman has served as a paid legal expert for the Ontario Nurses’ Association in their challenge to Directive 5, which restricted access to N95 masks in health care. He also served as a paid legal expert for the Elementary Teachers’ Federation of Ontario in its efforts to make schools safer in Ontario.

A version of this article first appeared on Medscape.com.

Bacillus Calmette-Guérin (BCG) vaccines are given to more than 100 million children every year, but there is considerable debate regarding the effectiveness of BCG vaccination in preventing tuberculosis and death, particularly among older children and adults.

The most extensive study ever conducted on the efficacy of the BCG vaccine for protection against tuberculosis, stratified by age and history of previous tuberculosis, was published in September 2022 in The Lancet Global Health. The study, which comprises a systematic review and meta-analysis, analyzed individual-level data from 26 case-contact cohort studies published over the past 20 years. The studies included data from 70,000 participants. The primary outcome was a composite of prevalent (diagnosed at or within 90 days of baseline) and incident (diagnosed more than 90 days after baseline) tuberculosis in contacts exposed to tuberculosis. Secondary outcomes were pulmonary tuberculosis, extrapulmonary tuberculosis, and mortality.

Participants were characterized as having been exposed to tuberculosis if they were reported to have been a close contact (either living in the same household or having substantial interaction outside the household) of a person with microbiologically or radiologically diagnosed pulmonary tuberculosis. Previous tuberculosis was defined as a positive interferon-gamma (IFN-gamma) release assay or tuberculin skin test, also known as PPD or Mantoux test.

Most studies included in the analysis were conducted in the past 10 years in countries with a high tuberculosis burden. Those countries included India, South Africa, China, Vietnam, Indonesia, Uganda, the Gambia, and Brazil.
 

Primary outcomes

The study’s main findings included the following:

• The overall effectiveness of BCG vaccination against all forms of tuberculosis was 18% (adjusted odds ratio, 0.82; 95% CI, 0.74-0.91).
• Stratified by age, BCG vaccination only significantly protected against all tuberculosis in children younger than 5 years (aOR, 0.63; 95% CI, 0.49-0.81).
• There was no protective effect among those whose previous tests for tuberculosis were negative unless they were younger than 5 years (aOR, 0.54; 95% CI, 0.32-0.90).
• Among contacts who had a positive tuberculin skin test or IFN-gamma release assay, BCG vaccination significantly protected against tuberculosis among all participants (aOR, 0.81; 95% CI, 0.69-0.96), participants younger than 5 years (aOR, 0.68; 95% CI, 0.47-0.97), and participants aged 5-9 years (aOR, 0.62; 95% CI, 0.38-0.99).
• BCG vaccination was protective against pulmonary tuberculosis (19% effectiveness), but this effect was only seen in children younger than 3 years (42% effectiveness) when stratified by age.
• Protection against all tuberculosis and pulmonary tuberculosis was greater among female participants than male participants.

“This is a definitive BCG protection study because it involves a significant number of individuals evaluated using this meta-analysis. Protection is clearly lost with age. From as early as age 5, no protective effect can be observed. Protection, including against pulmonary tuberculosis, can be observed up to 3 years of age,” stated study author Julio Croda, MD, PhD, chair of the Brazilian Society of Tropical Medicine.

Dr. Croda emphasized that the findings from their study indicate that BCG vaccine protects against pulmonary tuberculosis and that those results differ from results of some previous studies.

“Every physician believes the BCG vaccine protects against serious forms of tuberculosis up to age 5. That fact is not surprising at all,” Dr. Croda remarked. “However, the fact that it protects against pulmonary tuberculosis, especially in children younger than 3, was surprising. In medical practice, we did not believe in this protection.”

Currently, 1.2% of new tuberculosis cases in Brazil occur among those younger than 5. Nevertheless, these cases represent 40.1% of new diagnoses recorded among those younger than 15, highlighting the importance of protection for this age group. An increase in extrapulmonary tuberculosis cases was recently observed in patients younger than 5.

Isabella Ballalai, MD, PhD, is deputy chair of the Brazilian Society of Immunizations. Although she did not participate in this study, she commented on its findings. “All publications are welcome; they help us think,” she explained. She emphasized that the BCG vaccine is not optimal. “There are studies indicating 80% efficacy and others indicating 0%. So, what we can look at is decades of effectiveness in practice.”

Dr. Ballalai explained that the BCG vaccine could keep severe forms of tuberculosis, meningitis, and miliary tuberculosis at bay. She shared her experience of caring for several patients with tuberculous meningitis shortly after she had graduated. “Today, thanks to the BCG vaccine, we don’t see it anymore.” However, she pointed out that the vaccine›s efficacy and effectiveness against pulmonary tuberculosis are low and that pulmonary tuberculosis remains the most significant problem among adults.

Dr. Ballalai also emphasized a few shortcomings of the study. “One is the definition of ‘vaccinated’ and ‘unvaccinated,’ which was based on the presence or absence of a mark on the arm. Today, we know that the absence of a mark does not indicate that the child has not been vaccinated, nor that the vaccine has not been effective. Therefore, several vaccinated participants may have been included amongst the unvaccinated participants.”

The authors emphasized that the definition of “vaccinated” and “unvaccinated” was based on a scar and on vaccination records, and they recognized that participants who did not have a scar on their arm could have been misclassified. Regardless, it is still considered a sensitive indicator. “Few vaccinated children from various settings do not show a scar years after vaccine administration,” they stated in their article.
 

Adults unprotected

Dr. Ballalai also shared her concerns regarding the lack of protection for older individuals. “We know those older than 60 are at greater risk for complications of tuberculosis. Individuals in this age group naturally have a lower immunity, and they usually have comorbidities. From this study, I can only conclude what was already expected: that adults who received a BCG vaccine as infants are not clear of pulmonary tuberculosis.”

Dr. Croda agreed that it was already evident that the BCG vaccine administered at birth did not provide protection for adults. “In the past, even with 80%-90% vaccine coverage, there were numerous tuberculosis cases in adults in Brazil.”
 

Are boosters needed?

The authors concluded that immunoprotection needs to be boosted in older populations, as vaccination at birth is ineffective for adolescents and adults. They have also discussed whether children older than 10 years and adults could benefit from a booster shot.

Dr. Croda emphasized that there is no indication for this, because there are no data regarding protection with a booster dose during adulthood. However, he cited a study conducted in South Africa in which the BCG vaccine was compared with another vaccine, and another study, which is being conducted in India, is assessing whether a BCG booster offers protection against pulmonary tuberculosis. “There are few studies. Perhaps the revaccination of more vulnerable groups could be of interest, but additional studies are needed first.”

Dr. Croda intends to assess revaccination in those deprived of liberty, in which the incidence of tuberculosis is very high. From 2015 to 2021, many new cases were recorded in this population in Brazil. The number rose from 5,860 to 6,773 during that period.

“However, BCG revaccination carries a significant risk of patients presenting with serious adverse events,” Dr. Ballalai pointed out. He noted that several years ago, to extend protection, Brazil adopted a booster program for persons aged 10 years or older, but the program was discontinued owing to the numerous adverse events reported and the absence of evidence of benefit from increased protection against tuberculosis.

“The adult groups at greater risk for severe tuberculosis manifestations normally presented with an underlying disease, particularly in immunocompromised patient groups. The [administration of the] BCG [vaccine] is contraindicated for those who are immunocompromised. And, for the older population, we do not have data on [vaccine] safety,” she emphasized.
 

Nonspecific immune protection

One of the study’s secondary outcomes regarded mortality. Four studies in the meta-analysis followed up tuberculosis contacts for death. In these studies, which evaluated 20,000 participants, BCG vaccination was shown to be significantly protective against death for participants younger than 15 years.

However, the authors urged caution in interpreting these data. They emphasized that they were unable to identify specific mechanisms by which BCG vaccination might have reduced mortality, and there are possible study biases that could have led to an overestimation of mortality benefit. Moreover, given the observational nature of the included studies, vaccinated children might have had higher socioeconomic status and greater access to health care, and they may have been more likely to have received other vaccinations, compared with children who did not receive BCG vaccines.

Nevertheless, previous experimental and observational studies have found that BCG vaccination might provide nonspecific or off-target immune protection against an array of other pathogens.

“In small studies conducted in Africa, those younger than 5 were protected not only against tuberculosis but also against other respiratory diseases,” Dr. Croda affirmed. “However, these are small studies, and for now, there is no recommendation for using BCG vaccination to prevent other respiratory infections.”

A long-awaited, critical study on the impact of the BCG vaccine on COVID-19, in which Brazilian researchers participated, will be published in the New England Journal of Medicine.
 

New vaccines needed

The BCG vaccine is one of the oldest vaccines, but there are still several crucial unanswered questions about its use.

Previously published studies that examined the protective effect of BCG vaccination only considered low-burden settings and the historical literature before 1950. These studies need updating, but doing so has not been a simple task. To answer their questions, individual-level participant data for a prespecified list of variables, including the characteristics of the exposed participant (contact), the index case, and the environment, were requested from authors of all eligible studies.

Much of the data used in the published research were found through discussions with authors and experts in the field, as well as through data deposited in data storage repositories, conference abstracts, dissertations, and even direct requests to the authors. “The Pan-American Health Organization helped with this data collection and contacting some authors,” said Dr. Croda.

With the new data, the authors confirmed that infant BCG vaccination, although important to young children who are at high risk for tuberculosis, does not prevent adult-type cavitary tuberculosis and is therefore insufficient to impede the tuberculosis epidemic. “Novel vaccines are urgently needed,” they concluded.

“We need to develop novel, more effective vaccines, which, when administered during infancy, would ensure lifelong protection,” Dr. Croda added.

Dr. Croda and Dr. Ballalai reported no relevant financial relationships.

This article was translated from the Medscape Portuguese edition. A version of this article appeared on Medscape.com.

Bacillus Calmette-Guérin (BCG) vaccines are given to more than 100 million children every year, but there is considerable debate regarding the effectiveness of BCG vaccination in preventing tuberculosis and death, particularly among older children and adults.

The most extensive study ever conducted on the efficacy of the BCG vaccine for protection against tuberculosis, stratified by age and history of previous tuberculosis, was published in September 2022 in The Lancet Global Health. The study, which comprises a systematic review and meta-analysis, analyzed individual-level data from 26 case-contact cohort studies published over the past 20 years. The studies included data from 70,000 participants. The primary outcome was a composite of prevalent (diagnosed at or within 90 days of baseline) and incident (diagnosed more than 90 days after baseline) tuberculosis in contacts exposed to tuberculosis. Secondary outcomes were pulmonary tuberculosis, extrapulmonary tuberculosis, and mortality.

Participants were characterized as having been exposed to tuberculosis if they were reported to have been a close contact (either living in the same household or having substantial interaction outside the household) of a person with microbiologically or radiologically diagnosed pulmonary tuberculosis. Previous tuberculosis was defined as a positive interferon-gamma (IFN-gamma) release assay or tuberculin skin test, also known as PPD or Mantoux test.

Most studies included in the analysis were conducted in the past 10 years in countries with a high tuberculosis burden. Those countries included India, South Africa, China, Vietnam, Indonesia, Uganda, the Gambia, and Brazil.
 

Primary outcomes

The study’s main findings included the following:

• The overall effectiveness of BCG vaccination against all forms of tuberculosis was 18% (adjusted odds ratio, 0.82; 95% CI, 0.74-0.91).
• Stratified by age, BCG vaccination only significantly protected against all tuberculosis in children younger than 5 years (aOR, 0.63; 95% CI, 0.49-0.81).
• There was no protective effect among those whose previous tests for tuberculosis were negative unless they were younger than 5 years (aOR, 0.54; 95% CI, 0.32-0.90).
• Among contacts who had a positive tuberculin skin test or IFN-gamma release assay, BCG vaccination significantly protected against tuberculosis among all participants (aOR, 0.81; 95% CI, 0.69-0.96), participants younger than 5 years (aOR, 0.68; 95% CI, 0.47-0.97), and participants aged 5-9 years (aOR, 0.62; 95% CI, 0.38-0.99).
• BCG vaccination was protective against pulmonary tuberculosis (19% effectiveness), but this effect was only seen in children younger than 3 years (42% effectiveness) when stratified by age.
• Protection against all tuberculosis and pulmonary tuberculosis was greater among female participants than male participants.

“This is a definitive BCG protection study because it involves a significant number of individuals evaluated using this meta-analysis. Protection is clearly lost with age. From as early as age 5, no protective effect can be observed. Protection, including against pulmonary tuberculosis, can be observed up to 3 years of age,” stated study author Julio Croda, MD, PhD, chair of the Brazilian Society of Tropical Medicine.

Dr. Croda emphasized that the findings from their study indicate that BCG vaccine protects against pulmonary tuberculosis and that those results differ from results of some previous studies.

“Every physician believes the BCG vaccine protects against serious forms of tuberculosis up to age 5. That fact is not surprising at all,” Dr. Croda remarked. “However, the fact that it protects against pulmonary tuberculosis, especially in children younger than 3, was surprising. In medical practice, we did not believe in this protection.”

Currently, 1.2% of new tuberculosis cases in Brazil occur among those younger than 5. Nevertheless, these cases represent 40.1% of new diagnoses recorded among those younger than 15, highlighting the importance of protection for this age group. An increase in extrapulmonary tuberculosis cases was recently observed in patients younger than 5.

Isabella Ballalai, MD, PhD, is deputy chair of the Brazilian Society of Immunizations. Although she did not participate in this study, she commented on its findings. “All publications are welcome; they help us think,” she explained. She emphasized that the BCG vaccine is not optimal. “There are studies indicating 80% efficacy and others indicating 0%. So, what we can look at is decades of effectiveness in practice.”

Dr. Ballalai explained that the BCG vaccine could keep severe forms of tuberculosis, meningitis, and miliary tuberculosis at bay. She shared her experience of caring for several patients with tuberculous meningitis shortly after she had graduated. “Today, thanks to the BCG vaccine, we don’t see it anymore.” However, she pointed out that the vaccine›s efficacy and effectiveness against pulmonary tuberculosis are low and that pulmonary tuberculosis remains the most significant problem among adults.

Dr. Ballalai also emphasized a few shortcomings of the study. “One is the definition of ‘vaccinated’ and ‘unvaccinated,’ which was based on the presence or absence of a mark on the arm. Today, we know that the absence of a mark does not indicate that the child has not been vaccinated, nor that the vaccine has not been effective. Therefore, several vaccinated participants may have been included amongst the unvaccinated participants.”

The authors emphasized that the definition of “vaccinated” and “unvaccinated” was based on a scar and on vaccination records, and they recognized that participants who did not have a scar on their arm could have been misclassified. Regardless, it is still considered a sensitive indicator. “Few vaccinated children from various settings do not show a scar years after vaccine administration,” they stated in their article.
 

Adults unprotected

Dr. Ballalai also shared her concerns regarding the lack of protection for older individuals. “We know those older than 60 are at greater risk for complications of tuberculosis. Individuals in this age group naturally have a lower immunity, and they usually have comorbidities. From this study, I can only conclude what was already expected: that adults who received a BCG vaccine as infants are not clear of pulmonary tuberculosis.”

Dr. Croda agreed that it was already evident that the BCG vaccine administered at birth did not provide protection for adults. “In the past, even with 80%-90% vaccine coverage, there were numerous tuberculosis cases in adults in Brazil.”
 

Are boosters needed?

The authors concluded that immunoprotection needs to be boosted in older populations, as vaccination at birth is ineffective for adolescents and adults. They have also discussed whether children older than 10 years and adults could benefit from a booster shot.

Dr. Croda emphasized that there is no indication for this, because there are no data regarding protection with a booster dose during adulthood. However, he cited a study conducted in South Africa in which the BCG vaccine was compared with another vaccine, and another study, which is being conducted in India, is assessing whether a BCG booster offers protection against pulmonary tuberculosis. “There are few studies. Perhaps the revaccination of more vulnerable groups could be of interest, but additional studies are needed first.”

Dr. Croda intends to assess revaccination in those deprived of liberty, in which the incidence of tuberculosis is very high. From 2015 to 2021, many new cases were recorded in this population in Brazil. The number rose from 5,860 to 6,773 during that period.

“However, BCG revaccination carries a significant risk of patients presenting with serious adverse events,” Dr. Ballalai pointed out. He noted that several years ago, to extend protection, Brazil adopted a booster program for persons aged 10 years or older, but the program was discontinued owing to the numerous adverse events reported and the absence of evidence of benefit from increased protection against tuberculosis.

“The adult groups at greater risk for severe tuberculosis manifestations normally presented with an underlying disease, particularly in immunocompromised patient groups. The [administration of the] BCG [vaccine] is contraindicated for those who are immunocompromised. And, for the older population, we do not have data on [vaccine] safety,” she emphasized.
 

Nonspecific immune protection

One of the study’s secondary outcomes regarded mortality. Four studies in the meta-analysis followed up tuberculosis contacts for death. In these studies, which evaluated 20,000 participants, BCG vaccination was shown to be significantly protective against death for participants younger than 15 years.

However, the authors urged caution in interpreting these data. They emphasized that they were unable to identify specific mechanisms by which BCG vaccination might have reduced mortality, and there are possible study biases that could have led to an overestimation of mortality benefit. Moreover, given the observational nature of the included studies, vaccinated children might have had higher socioeconomic status and greater access to health care, and they may have been more likely to have received other vaccinations, compared with children who did not receive BCG vaccines.

Nevertheless, previous experimental and observational studies have found that BCG vaccination might provide nonspecific or off-target immune protection against an array of other pathogens.

“In small studies conducted in Africa, those younger than 5 were protected not only against tuberculosis but also against other respiratory diseases,” Dr. Croda affirmed. “However, these are small studies, and for now, there is no recommendation for using BCG vaccination to prevent other respiratory infections.”

A long-awaited, critical study on the impact of the BCG vaccine on COVID-19, in which Brazilian researchers participated, will be published in the New England Journal of Medicine.
 

New vaccines needed

The BCG vaccine is one of the oldest vaccines, but there are still several crucial unanswered questions about its use.

Previously published studies that examined the protective effect of BCG vaccination only considered low-burden settings and the historical literature before 1950. These studies need updating, but doing so has not been a simple task. To answer their questions, individual-level participant data for a prespecified list of variables, including the characteristics of the exposed participant (contact), the index case, and the environment, were requested from authors of all eligible studies.

Much of the data used in the published research were found through discussions with authors and experts in the field, as well as through data deposited in data storage repositories, conference abstracts, dissertations, and even direct requests to the authors. “The Pan-American Health Organization helped with this data collection and contacting some authors,” said Dr. Croda.

With the new data, the authors confirmed that infant BCG vaccination, although important to young children who are at high risk for tuberculosis, does not prevent adult-type cavitary tuberculosis and is therefore insufficient to impede the tuberculosis epidemic. “Novel vaccines are urgently needed,” they concluded.

“We need to develop novel, more effective vaccines, which, when administered during infancy, would ensure lifelong protection,” Dr. Croda added.

Dr. Croda and Dr. Ballalai reported no relevant financial relationships.

This article was translated from the Medscape Portuguese edition. A version of this article appeared on Medscape.com.

Bacillus Calmette-Guérin (BCG) vaccines are given to more than 100 million children every year, but there is considerable debate regarding the effectiveness of BCG vaccination in preventing tuberculosis and death, particularly among older children and adults.

The most extensive study ever conducted on the efficacy of the BCG vaccine for protection against tuberculosis, stratified by age and history of previous tuberculosis, was published in September 2022 in The Lancet Global Health. The study, which comprises a systematic review and meta-analysis, analyzed individual-level data from 26 case-contact cohort studies published over the past 20 years. The studies included data from 70,000 participants. The primary outcome was a composite of prevalent (diagnosed at or within 90 days of baseline) and incident (diagnosed more than 90 days after baseline) tuberculosis in contacts exposed to tuberculosis. Secondary outcomes were pulmonary tuberculosis, extrapulmonary tuberculosis, and mortality.

Participants were characterized as having been exposed to tuberculosis if they were reported to have been a close contact (either living in the same household or having substantial interaction outside the household) of a person with microbiologically or radiologically diagnosed pulmonary tuberculosis. Previous tuberculosis was defined as a positive interferon-gamma (IFN-gamma) release assay or tuberculin skin test, also known as PPD or Mantoux test.

Most studies included in the analysis were conducted in the past 10 years in countries with a high tuberculosis burden. Those countries included India, South Africa, China, Vietnam, Indonesia, Uganda, the Gambia, and Brazil.
 

Primary outcomes

The study’s main findings included the following:

• The overall effectiveness of BCG vaccination against all forms of tuberculosis was 18% (adjusted odds ratio, 0.82; 95% CI, 0.74-0.91).
• Stratified by age, BCG vaccination only significantly protected against all tuberculosis in children younger than 5 years (aOR, 0.63; 95% CI, 0.49-0.81).
• There was no protective effect among those whose previous tests for tuberculosis were negative unless they were younger than 5 years (aOR, 0.54; 95% CI, 0.32-0.90).
• Among contacts who had a positive tuberculin skin test or IFN-gamma release assay, BCG vaccination significantly protected against tuberculosis among all participants (aOR, 0.81; 95% CI, 0.69-0.96), participants younger than 5 years (aOR, 0.68; 95% CI, 0.47-0.97), and participants aged 5-9 years (aOR, 0.62; 95% CI, 0.38-0.99).
• BCG vaccination was protective against pulmonary tuberculosis (19% effectiveness), but this effect was only seen in children younger than 3 years (42% effectiveness) when stratified by age.
• Protection against all tuberculosis and pulmonary tuberculosis was greater among female participants than male participants.

“This is a definitive BCG protection study because it involves a significant number of individuals evaluated using this meta-analysis. Protection is clearly lost with age. From as early as age 5, no protective effect can be observed. Protection, including against pulmonary tuberculosis, can be observed up to 3 years of age,” stated study author Julio Croda, MD, PhD, chair of the Brazilian Society of Tropical Medicine.

Dr. Croda emphasized that the findings from their study indicate that BCG vaccine protects against pulmonary tuberculosis and that those results differ from results of some previous studies.

“Every physician believes the BCG vaccine protects against serious forms of tuberculosis up to age 5. That fact is not surprising at all,” Dr. Croda remarked. “However, the fact that it protects against pulmonary tuberculosis, especially in children younger than 3, was surprising. In medical practice, we did not believe in this protection.”

Currently, 1.2% of new tuberculosis cases in Brazil occur among those younger than 5. Nevertheless, these cases represent 40.1% of new diagnoses recorded among those younger than 15, highlighting the importance of protection for this age group. An increase in extrapulmonary tuberculosis cases was recently observed in patients younger than 5.

Isabella Ballalai, MD, PhD, is deputy chair of the Brazilian Society of Immunizations. Although she did not participate in this study, she commented on its findings. “All publications are welcome; they help us think,” she explained. She emphasized that the BCG vaccine is not optimal. “There are studies indicating 80% efficacy and others indicating 0%. So, what we can look at is decades of effectiveness in practice.”

Dr. Ballalai explained that the BCG vaccine could keep severe forms of tuberculosis, meningitis, and miliary tuberculosis at bay. She shared her experience of caring for several patients with tuberculous meningitis shortly after she had graduated. “Today, thanks to the BCG vaccine, we don’t see it anymore.” However, she pointed out that the vaccine›s efficacy and effectiveness against pulmonary tuberculosis are low and that pulmonary tuberculosis remains the most significant problem among adults.

Dr. Ballalai also emphasized a few shortcomings of the study. “One is the definition of ‘vaccinated’ and ‘unvaccinated,’ which was based on the presence or absence of a mark on the arm. Today, we know that the absence of a mark does not indicate that the child has not been vaccinated, nor that the vaccine has not been effective. Therefore, several vaccinated participants may have been included amongst the unvaccinated participants.”

The authors emphasized that the definition of “vaccinated” and “unvaccinated” was based on a scar and on vaccination records, and they recognized that participants who did not have a scar on their arm could have been misclassified. Regardless, it is still considered a sensitive indicator. “Few vaccinated children from various settings do not show a scar years after vaccine administration,” they stated in their article.
 

Adults unprotected

Dr. Ballalai also shared her concerns regarding the lack of protection for older individuals. “We know those older than 60 are at greater risk for complications of tuberculosis. Individuals in this age group naturally have a lower immunity, and they usually have comorbidities. From this study, I can only conclude what was already expected: that adults who received a BCG vaccine as infants are not clear of pulmonary tuberculosis.”

Dr. Croda agreed that it was already evident that the BCG vaccine administered at birth did not provide protection for adults. “In the past, even with 80%-90% vaccine coverage, there were numerous tuberculosis cases in adults in Brazil.”
 

Are boosters needed?

The authors concluded that immunoprotection needs to be boosted in older populations, as vaccination at birth is ineffective for adolescents and adults. They have also discussed whether children older than 10 years and adults could benefit from a booster shot.

Dr. Croda emphasized that there is no indication for this, because there are no data regarding protection with a booster dose during adulthood. However, he cited a study conducted in South Africa in which the BCG vaccine was compared with another vaccine, and another study, which is being conducted in India, is assessing whether a BCG booster offers protection against pulmonary tuberculosis. “There are few studies. Perhaps the revaccination of more vulnerable groups could be of interest, but additional studies are needed first.”

Dr. Croda intends to assess revaccination in those deprived of liberty, in which the incidence of tuberculosis is very high. From 2015 to 2021, many new cases were recorded in this population in Brazil. The number rose from 5,860 to 6,773 during that period.

“However, BCG revaccination carries a significant risk of patients presenting with serious adverse events,” Dr. Ballalai pointed out. He noted that several years ago, to extend protection, Brazil adopted a booster program for persons aged 10 years or older, but the program was discontinued owing to the numerous adverse events reported and the absence of evidence of benefit from increased protection against tuberculosis.

“The adult groups at greater risk for severe tuberculosis manifestations normally presented with an underlying disease, particularly in immunocompromised patient groups. The [administration of the] BCG [vaccine] is contraindicated for those who are immunocompromised. And, for the older population, we do not have data on [vaccine] safety,” she emphasized.
 

Nonspecific immune protection

One of the study’s secondary outcomes regarded mortality. Four studies in the meta-analysis followed up tuberculosis contacts for death. In these studies, which evaluated 20,000 participants, BCG vaccination was shown to be significantly protective against death for participants younger than 15 years.

However, the authors urged caution in interpreting these data. They emphasized that they were unable to identify specific mechanisms by which BCG vaccination might have reduced mortality, and there are possible study biases that could have led to an overestimation of mortality benefit. Moreover, given the observational nature of the included studies, vaccinated children might have had higher socioeconomic status and greater access to health care, and they may have been more likely to have received other vaccinations, compared with children who did not receive BCG vaccines.

Nevertheless, previous experimental and observational studies have found that BCG vaccination might provide nonspecific or off-target immune protection against an array of other pathogens.

“In small studies conducted in Africa, those younger than 5 were protected not only against tuberculosis but also against other respiratory diseases,” Dr. Croda affirmed. “However, these are small studies, and for now, there is no recommendation for using BCG vaccination to prevent other respiratory infections.”

A long-awaited, critical study on the impact of the BCG vaccine on COVID-19, in which Brazilian researchers participated, will be published in the New England Journal of Medicine.
 

New vaccines needed

The BCG vaccine is one of the oldest vaccines, but there are still several crucial unanswered questions about its use.

Previously published studies that examined the protective effect of BCG vaccination only considered low-burden settings and the historical literature before 1950. These studies need updating, but doing so has not been a simple task. To answer their questions, individual-level participant data for a prespecified list of variables, including the characteristics of the exposed participant (contact), the index case, and the environment, were requested from authors of all eligible studies.

Much of the data used in the published research were found through discussions with authors and experts in the field, as well as through data deposited in data storage repositories, conference abstracts, dissertations, and even direct requests to the authors. “The Pan-American Health Organization helped with this data collection and contacting some authors,” said Dr. Croda.

With the new data, the authors confirmed that infant BCG vaccination, although important to young children who are at high risk for tuberculosis, does not prevent adult-type cavitary tuberculosis and is therefore insufficient to impede the tuberculosis epidemic. “Novel vaccines are urgently needed,” they concluded.

“We need to develop novel, more effective vaccines, which, when administered during infancy, would ensure lifelong protection,” Dr. Croda added.

Dr. Croda and Dr. Ballalai reported no relevant financial relationships.

This article was translated from the Medscape Portuguese edition. A version of this article appeared on Medscape.com.

The American Academy of Pediatrics is cautioning physicians and parents to be on the lookout for unnecessary diagnostic testing associated with several common pediatric conditions.

Children seen for these conditions in emergency settings and even in primary care offices could experience avoidable pain, exposure to harmful radiation, and other harms, according to the group.

“The emergency department has the ability to rapidly perform myriad diagnostic tests and receive results quickly,” said Paul Mullan, MD, MPH, chair of the AAP’s Section of Emergency Medicine’s Choosing Wisely task force. “However, this comes with the danger of diagnostic overtesting.”

The five recommendations are as follows:

• Radiographs should not be obtained for children with bronchiolitis, croup, asthma, or first-time wheezing.
• Laboratory tests for screening should not be undertaken in the medical clearance process of children who require inpatient psychiatric admission unless clinically indicated.
• Laboratory testing or a CT scan of the head should not be ordered for a child with an unprovoked, generalized seizure or a simple febrile seizure whose mental status has returned to baseline.
• Abdominal radiographs should not be obtained for suspected constipation.
• Comprehensive viral panel testing should not be undertaken for children who are suspected of having respiratory viral illnesses.

The AAP task force partnered with Choosing Wisely Canada to create the recommendations. The list is the first of its kind to be published jointly by two countries, according to the release.

“We hope this Choosing Wisely list will encourage clinicians to rely on their clinical skills and avoid unnecessary tests,” said Dr. Mullan, who is also a physician at Children’s Hospital of the King’s Daughters and professor of pediatrics at Eastern Virginia Medical School, Norfolk.

A version of this article first appeared on Medscape.com.

The American Academy of Pediatrics is cautioning physicians and parents to be on the lookout for unnecessary diagnostic testing associated with several common pediatric conditions.

Children seen for these conditions in emergency settings and even in primary care offices could experience avoidable pain, exposure to harmful radiation, and other harms, according to the group.

“The emergency department has the ability to rapidly perform myriad diagnostic tests and receive results quickly,” said Paul Mullan, MD, MPH, chair of the AAP’s Section of Emergency Medicine’s Choosing Wisely task force. “However, this comes with the danger of diagnostic overtesting.”

The five recommendations are as follows:

• Radiographs should not be obtained for children with bronchiolitis, croup, asthma, or first-time wheezing.
• Laboratory tests for screening should not be undertaken in the medical clearance process of children who require inpatient psychiatric admission unless clinically indicated.
• Laboratory testing or a CT scan of the head should not be ordered for a child with an unprovoked, generalized seizure or a simple febrile seizure whose mental status has returned to baseline.
• Abdominal radiographs should not be obtained for suspected constipation.
• Comprehensive viral panel testing should not be undertaken for children who are suspected of having respiratory viral illnesses.

The AAP task force partnered with Choosing Wisely Canada to create the recommendations. The list is the first of its kind to be published jointly by two countries, according to the release.

“We hope this Choosing Wisely list will encourage clinicians to rely on their clinical skills and avoid unnecessary tests,” said Dr. Mullan, who is also a physician at Children’s Hospital of the King’s Daughters and professor of pediatrics at Eastern Virginia Medical School, Norfolk.

A version of this article first appeared on Medscape.com.

The American Academy of Pediatrics is cautioning physicians and parents to be on the lookout for unnecessary diagnostic testing associated with several common pediatric conditions.

Children seen for these conditions in emergency settings and even in primary care offices could experience avoidable pain, exposure to harmful radiation, and other harms, according to the group.

“The emergency department has the ability to rapidly perform myriad diagnostic tests and receive results quickly,” said Paul Mullan, MD, MPH, chair of the AAP’s Section of Emergency Medicine’s Choosing Wisely task force. “However, this comes with the danger of diagnostic overtesting.”

The five recommendations are as follows:

• Radiographs should not be obtained for children with bronchiolitis, croup, asthma, or first-time wheezing.
• Laboratory tests for screening should not be undertaken in the medical clearance process of children who require inpatient psychiatric admission unless clinically indicated.
• Laboratory testing or a CT scan of the head should not be ordered for a child with an unprovoked, generalized seizure or a simple febrile seizure whose mental status has returned to baseline.
• Abdominal radiographs should not be obtained for suspected constipation.
• Comprehensive viral panel testing should not be undertaken for children who are suspected of having respiratory viral illnesses.

The AAP task force partnered with Choosing Wisely Canada to create the recommendations. The list is the first of its kind to be published jointly by two countries, according to the release.

“We hope this Choosing Wisely list will encourage clinicians to rely on their clinical skills and avoid unnecessary tests,” said Dr. Mullan, who is also a physician at Children’s Hospital of the King’s Daughters and professor of pediatrics at Eastern Virginia Medical School, Norfolk.

A version of this article first appeared on Medscape.com.