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...
*Donor blood should be of the same type as the recipient (A â A, B â B) *In an emergency, Type O can be donated to any blood type-Since O does have anti-A and anti-B antibodies this is only done in an emergency.