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...
An individual with a B negative blood type has antigen B but with no Rh antigen on the blood. Having the presence of B antigen and the absence of Rh antigen, B negative blood type can only receive B- and O-. A transfusion with the usage of any other blood type can initiate an immune response.