Blood groups and transfusions..... I have learnt that when you transfuse the wrong blood to a recipient whose antibodies work against the donated blood that agglutination occurs. eg - if you transfuse A blood to a B person, since the B person will possess anti-A antibodies which will cause agglutination, but an AB person can recieve A blood because their blood contains no antibodies. But surely the donated A blood would contain some anti-B antibodies which would cause agglutination of the red blood cells in the AB person? Why does this not happen? ie - we still call the AB a universal recipient. Thanks.