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...
4. Blood Type Compatibility: AB- Can Only Be Given To AB- and AB+. An AB- donor can only give blood to individuals with AB+ and AB- blood type. This is because of the presence of both antigens A and B and the absence of Rh antigen in the donorâs blood. Any transfusion of AB- to any other blood groups can cause immune attacks.