different blood types. There are 33
different blood-group systems in humans,
but the most common are the A, B, O
system, which has four types. Your red
blood cells are coated in A antigens, B
antigens, both A and B antigens, or
neither (making you blood type O). We
know these factors affect blood
transfusion, but the reason behind
different blood types seems to be related
to the spread of infection; for example,
people with blood type O are more
susceptible to bubonic plague, but are
better protected against malaria.
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