Lewis Kaplan of the Perelman School of Medicine said people with a lower risk of contracting COVID-19 according to their blood type shouldn’t get overly confident. "It might mean they have less risk, but if you engage in risky behavior, we don't know just how much risk you need to incur to overwhelm whatever potential protection you might have," he said. "We have no clue."
https://www.nbcnews.com/health/health-news/how-blood-type-may-affect-your-coronavirus-risk-n1233022 NBC News