Canada Finds O- Blood Type Associated With Lowest Coronavirus Infection Rate

A population-based cohort study of 225,556 people in Ontario, Canada, found the O and Rh− blood groups may be associated with a slightly lower risk for SARS-CoV-2 infection and severe COVID-19 illness. Of the study participants infected with the new coronavirus, the lowest unadjusted probability of SARS-CoV-2 infection was among the O− blood group (2.1%), and the highest was in the B-positive blood group (4.2%).

This new study was published in the Annuals of Internal Medicine on November 24, 2020.