Early in the Covid-19 pandemic, researchers found preliminary evidence suggesting that people’s blood type might be an important risk factor — both for being infected by the virus and for falling dangerously ill. But over the past few months, after looking at thousands of additional patients with Covid-19, scientists are reporting a much weaker link to blood type. Two studies — one at the Massachusetts General Hospital and the other at Columbia Presbyterian Hospital in New York — did not find that Type A blood increases the odds that people will be infected with Covid-19. The new reports do find evidence that people with Type O blood may be slightly less likely to be infected. “No one should think they’re protected,” said Nicholas Tatonetti, a data scientist at Columbia University.

Source: New York Times July 15, 2020 14:19 UTC