All humans can be grouped into ABO and Rh+/- blood groups (at a
minimum). Is there any advantage at all to one group or the
other? This article hints that there are some pathogens that
display a preference to a blood type (for example
Schistosomiasis apparently being more common in people with
blood group A, although it could be that more people have type A
in the areas that the parasite inhabits). Is there any
literature out there to support or refute this claim or provide
similar examples? Beyond ABO-Rh, is there any advantage or
disadvantage (excluding the obvious difficulties in finding a
donor after accident/trauma) in the 30 other blood type suffixes
recognised by the International Society of Blood Transfusions
(ISBT)? I'd imagine not (or at least very minimal) but it would
be interesting to find out if anyone knows more.