The Warsaw Treaty Organization (also known as the Warsaw Pact) was a political and military alliance established on May 14, 1955 between the Soviet Union and several Eastern European countries.
1 Donors with blood type A... can donate to recipients with blood types A and AB. 2  Donors with blood type B... can donate to recipients with blood types B and AB.  Donors with blood type AB...
Group O have no antigens, but have anti-A and anti-B. This means that they can only receive blood from other people in group O, but they can give to any ABO group. Group A have anti-B antibodies, so they can only receive blood from people within group A or O. These two groups do not have the B-antigen. They can donate blood to people from group A or AB. Group B have anti-A antibodies, so they can only receive blood from people within group B or O. They can donate to groups B or AB.