Possible Link Between Blood Type and COVID-19 Susceptibility and Severity

Individuals with blood type O may have lowest risk of infection; individuals with A and AB may have increased risk of severe clinical outcomes.

Blood type O may offer some protection against COVID-19 infection, according to a retrospective study. Researchers compared Danish health registry data from more than 473,000 individuals tested for COVID-19 to data from a control group of more than 2.2 million people from the general population. Among the COVID-19 positive, they found fewer people with blood type O and more people with A, B, and AB types.

Release date: 14 October 2020
Source: American Society of Hematology