Why type A blood can increase the risk of COVID-19

The SARS-CoV-2 coronavirus can attach itself more easily to cells in the airways of people with the disease type A blood compared to those with type B or O blood, a new study suggests. The results suggest a possible explanation for why, throughout the pandemic, studies have shown that people with type A blood are more likely to catch COVID-19 and develop severe symptoms than those with type A blood. other blood groups.

Laboratory experiments have revealed that part of the coronavirus called a ‘receptor binding domain’ (RBD), which binds directly to cells to trigger infection, also attaches itself to unique molecules associated with type A blood. These molecules, called antigens, appear on cells that line the airways, including the lungs, according to the study, published on March 3 in the journal Advances in blood.