Patients with blood type 2 (A) are most prone to the severe course of COVID-19 and to death from the disease, American scientists from the National Institute for Health Research (NIHR) say, PLOS Genetics writes. The scientists analyzed more than 3,000 blood proteins to identify those that increase the likelihood of hospitalization and death from coronavirus infection. As a result, the physicians identified 6 proteins that lead to a severe course of the disease, as well as 8 that form an increased protection. The second blood group (A) causes the greatest risks of complications and the need for respiratory support. These findings are consistent with previous studies. According to experts, this discovery has shaped the goals of future developments in COVID-19 treatment and prevention. However, further study of the phenomenon is needed for definitive conclusions, the scientists said.