makes you think that people with o pos blood have different diseases than someone with b pos???
the different blood groups and the diseases that affects different blood groups. Cholera offers a huge selective disadvantage to Blood Type O. Effectively speaking, Blood Type O is almost guaranteed to be the blood type that gets the most severe form of this once dreaded epidemic infection. It has been speculated that the low incidence of Type O over Type A in Mediterranean cities with ancient roots may in fact have been the selective…
