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...
A person with an A+ (positive) blood type can receive blood types A and O (A+, A-, O+, and O). Moreover, type AB is considered the universal recipient blood type because type AB individuals can receive all blood types (and is the only blood type that can accept type AB blood). Type O blood is considered the universal donor blood type because type O blood is accepted by all blood types.