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Mounting evidence ties blood type to COVID-19 risk, O may help, A may hurt
Residents have their blood drawn for an antibody test for the coronavirus, also called a serology test, June 16, 2020 in Washington, DC (Win McNamee/Getty Images)LOS ANGELES - Growing evidence suggests that blood type may influence whether someone becomes infected with the novel coronavirus or develops severe complications from the illness.In two new studies, published last week in the journal Blood Advances, scientists found key differences between blood type. Those with type A blood were more likely to have severe disease, while those with type O were less likely.In the first study, researchers in Denmark looked at data on 473,654 people, who tested for COVID-19 from February to July.