Blood Type Doesn't Affect Your COVID Risk By Dennis Thompson HealthDay Reporter MONDAY, April 5, 2021 (HealthDay News) -- A or B, AB or O, it doesn't matter -- your blood type has nothing to do with your risk of contracting severe COVID-19, a new study concludes. Early in the pandemic, some reports suggested people with A-type blood were more susceptible to COVID, while those with O-type blood were less so. But a review of nearly 108,000 patients in a three-state health network has found no link at all between blood type and COVID risk. "Since the beginning of this pandemic, there have been associations postulated between blood type and disease susceptibility," said Dr. Amesh Adalja, a senior scholar with the Johns Hopkins Center for Health Security.