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Asked • 06/16/19

Why do people have antibodies against other blood types?

The ABO blood type divides each blood type according to whether they have the "A" and "B" antigen(s) (AB has both, O has none). People also have antibodies against the antigens they don't have (AB has none, O has both), even before they have ever come in contact with those antigens.Why do people have antibodies against these antigens they have never come in contact with? This isn't the normal situation for the immune system (e.g. for a virus or the blood type rhesus factor)

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