Type O blood linked to lower COVID risk, taking Vitamin D unlikely to help

Among 225,556 Canadians who were tested for the virus, the risk for a COVID-19 diagnosis was 12% lower and the risk for severe COVID-19 or death was 13% lower in people with blood group O versus those with A, AB, or B, researchers reported on Tuesday in Annals of Internal Medicine. People in any blood group who were Rh-negative were also somewhat protected, especially if they had O-negative blood. People in these blood type groups may have developed antibodies that can recognize some aspect of the new virus, coauthor Dr. Joel Ray of St. Michael's Hospital in Toronto told Reuters.

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