(A) A person with blood group‘O’ is a universal donor. Intrans fusions of packed red blood cells, individuals with type O Rh D negative blood are often called universal donors.Those with type AB Rh D positive blood are called universal recipients. Blood donors with exceptionally strong anti-A, anti-B or any atypical blood group antibody may be excluded from blood donation. In general, while the plasma fraction of a blood transfusion may carry donor antibodies not found in the recipient, a significant reaction is unlikely because of dilution.