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...
(Blood Type O is the Universal Donor: donors with O blood are compatible with any other blood type) (Blood Type AB is the Universal Recipient: recipients with AB blood are compatible with any other blood type) * Recently, it has been discovered that some donors with blood type A may donate to a blood type O recipient. Person with blood type A or AB and someone with blood type B may donate to a person with B or AB. A person with blood type AB may only donate to an individual who has that same blood type.