| During the peak of hospitalizations of patients with severe Covid-19 in Italy and Spain in March, a group of researchers in these and other countries obtained and analyzed samples, resulting in the identification of two chromosomal loci with Covid-19–induced respiratory failure. The findings confirm potential involvement of the ABO blood-group system |
In this group of patient studied, a blood-group–specific analysis showed a higher risk of severe disease complication (respiratory failure) in blood group A than in other blood groups and a protective effect in blood group O as compared with other blood groups.