(1) Individuals with type Oblood are often called universaldonors, and those with typeAB blood are called universalrecipients. Blood group Oindividualsdo not have either A orB antigens on the surface oftheir RBCs, and their bloodserum contains IgM anti-A andanti-B antibodies. Therefore, agroup O individual can receiveblood only from a group O individual,but can donate bloodto individuals of any ABOblood group (i.e., A, B, O or AB).