The amount of antibodies in the donors blood is not enough to cause a reaction clinically. The problem arises not when the antibodies meet the antigen but when the lymphocytes do, get activated and start a type2 reaction, which happens if you donate those as been said by steptaker in bone marrow transplants.
Putting it simply, to avoid confusion
... the donor donates only the antigen not the antibodies, the recepient has both .
So in your example the serum of an O person which contains the antibodies is given only when he is the recepient.
Putting it simply, to avoid confusion
... the donor donates only the antigen not the antibodies, the recepient has both . So in your example the serum of an O person which contains the antibodies is given only when he is the recepient.
