A person's blood type and other genetic factors may be linked with severity of coronavirus infection, according to European researchers looking for further clues about why COVID-19 hits some so much harder than others. At the peak of the epidemic in Europe, researchers analyzed the genes of more than 4,000 people to look for variations that were common in those who became  infected with the coronavirus and developed severe COVID-19. The risk for severe COVID-19 was 45% higher for people with type “A” blood than those with other blood types. It appeared to be 35% lower for people with type “O”. It is also suggested that a genetic test and a person's blood type might provide useful tools for identifying those who may be at greater risk of serious illness.

 health.economictimes.indiatimes.com