An HLA-compatible platelet transfusion was followed by chills, fever, and severe respiratory distress in a
multitransfused patient with chronic lymphocytic leukemia. During the previous 7 days the patient had received
blood products without incident, including 8 units of red blood cells (RBC), 24 units of pooled random donor platelet
concentrates, and five HLA-compatible platelet pheresis products. The patient had no demonstrable RBC, HLA
lymphocytotoxic, platelet or granulocyte antibodies. The platelet donor, a multiparous female, had no granulocyte or
RBC antibodies but had lymphocytotoxic antibodies against HLA-A2 CREG (cross-reacting group A2, A28, A23,
A24) which reacted not with lymphocytes of the patient but with lymphocytes of the donor whose RBC were
transfused 24 h prior to the platelet transfusion reaction and whose HLA type is A23, A24; B44, B57. No RBC donors
had HLA lymphocytotoxic, granulocyte, or platelet antibodies against the platelet donor. The patient received three
subsequent platelet transfusions from the same donor after removal of the antibody-laden plasma with no adverse
reaction. These data suggest an interdonor reaction caused by the presence of cells from the RBC donor received by
the patient 24 h prior to the transfusion of donor lymphocytotoxic antibody to HLA-A2 CREG antigens.