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...
Some are just more rare than others. Everyone should donate blood, regardless of their blood type. O-is the universal donor (which means anyone can use their blood) and AB+ is the universal receiver (which means they can use any type of blood).All the other types are used only on patients with the same blood type (A, B, AB or O).The most common type of grouping is the ABO grouping.ome are just more rare than others. Everyone should donate blood, regardless of their blood type. O-is the universal donor (which means anyone can use their blood) and AB+ is the universal receiver (which means they can use any type of blood).