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...
1 Group O-is the universal donor, but a person with O-blood type can only receive this type. 2  Group A+ can donate red blood cells to A+ and AB+ recipients. 3  Group A-can donate red blood cells to A+ or A-and to AB+ or AB-recipients.4  Group B+ can donate red blood cells to B+ and AB+ recipients.lood types are inherited. The four major blood groups are O, A, B and AB. They are also positive or negative (the Rh factor), creating eight major blood types. Your type is determined by the presence or absence of antigens on the surface of your red blood cells.