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Patients with type O and rhesus negative (Rh-) blood groups may have a lower risk of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and severe coronavirus disease 2019 (COVID-19) illness, according to a study published in the Annals of Internal Medicine.
Investigators also suggested further research on how ABO status may moderate venous thromboembolism occurrence, a known complication of COVID-19, since blood group O patients have been associated with a decreased risk of venous thromboembolism in prior research.
researchers in Canada found that among 95 patients critically ill with Covid-19, a higher proportion with blood type A or AB -- 84% -- required mechanical ventilation compared with patients with blood group O or B, which was 61%. The Canadian study also found those with blood type A or AB had a longer stay in the intensive care unit, a median of 13.5 days, compared with those with blood group O or B, who had a median of nine days.