Study ties blood type to COVID-19 risk; O may help, A hurt

A genetic analysis of COVID-19 patients suggests that blood type might influence whether someone develops severe disease. Wednesday’s report in the New England Journal of Medicine does not prove a blood type connection, but it does confirm a previous report from China of such a link. “Most of us discounted it because it was a very crude study,” Dr. Parameswar Hari, a blood specialist at the Medical College of Wisconsin, said of the report from China.

source https://news.yahoo.com/study-ties-blood-type-covid-000138779.html