By DONALD M. ERvIN, M.D., RICHARD M. CHRISTIAN, M.D., AND LAWRENCE E. YOUNG, M.D. H EMOLYTIC reactions resulting from transfusion of group 0 plasma into group A recipients, while not common, have been reported with increasing frequency during the past few years.’5 Reactions of this type are usually not as dramatic or as severe as those resulting from transfusion of incompatible whole blood and ...