Two studies suggest that people with blood type O may be less affected by Covid-19 infection and have a small chance of getting seriously ill; Specialists state more research is obliged. The study provides further data that blood type (also called blood group) may impact a person’s sensitivity to infection and their chance of having a critical period of the illness. The causes of this link need more research to say if it has benefits for patients.

A study from Denmark observed that among 7,422 people who were Covid-19 positive, only 38.4% have blood type O — Despite the fact that amid a group of 2.2 million people who were not examined, that blood type made up 41.7% of the number of people. When compared to another group, 44.4% of group A tested positive, while in the other broader population in Denmark that blood type makes up 42.4%. Meanwhile, specialists in Canada uncovered that of all 95 cases severely ill with Covid-19, a greater proportion with type A or AB — 84% — needed mechanical ventilation in comparison to cases with blood type O or B, which was 61%. The Canadian study also detected those with blood type A or AB had a longer stay in the Intensive Care Unit (ICU), compared with those with blood type O or B.