The risk for severe COVID-19 was 45 percent higher for people with type A blood than those with other blood types. It appeared to be 35 percent lower for people with type O.

The researchers, led by Dr. Andre Franke from Christian-Albrecht University in Kiel, Germany, and Dr. Tom Karlsen, from Oslo University Hospital in Norway, also found a relationship between COVID-19 severity and blood type.

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