Key clinical point: Blood group O was associated with a decreased risk for SARS-CoV-2 infection.
Major finding: The relative risk for group O individuals acquiring COVID-19 was 0.87 (95% confidence interval, 0.83-0.91).
Study details: A retrospective cohort analysis of all Danish individuals tested for SARS-CoV-2 between Feb. 27, 2020, and July 30, 2020, with a known ABO blood group.
Disclosures: One author reported receiving fees from Bristol Myers Squibb, Novartis, and Roche. The remaining authors reported they had no competing financial interests.
Barnkob MB et al. Blood Adv. 2020 Oct 14. doi: 10.1182/bloodadvances.2020002657.