But what determines blood type and what does that blood type mean? Blood types are determined by antigens -- a substance that triggers an immune response -- on the surface of red blood cells.

Stowell was one of the authors of a study published last week that found that the coronavirus is particularly attracted to the blood type A antigen found on respiratory cells. But before anyone ...

The antigens on a person's red blood cells are recognized as safe by the immune system, but someone with type B blood will have antibodies that attack type A antigens, for example. Another important ...