23andMe Finds More Evidence That Blood Type Plays Role in Virus

Research from genetic-testing giant 23andMe Inc. found differences in a gene that influences a person’s blood type can affect a person’s susceptibility to Covid-19.

Scientists have been looking at genetic factors to try to determine why some people who contract the new coronavirus experience no symptoms, while others become gravely ill. In April, 23andMe launched a study that sought to use the millions of profiles in its DNA database to shed light on the role genetics play in the disease.

Preliminary results from more than 750,000 participants suggests type O blood is especially protective against SARS-CoV-2, the virus that causes Covid-19, ...