Post‐Transfusion Purpura Associated with Anti‐Baka and Anti‐PlA2 Platelet Antibodies and Delayed Haemolytic Transfusion Reaction

Abstract
The occurrence of post‐transfusion purpura (PTP) in a 16‐year‐old girl with sickle/β‐thalassaemia is described. Clinically this was a typical case of PTP, but it was unusual serologically. Anti‐Baka and anti‐PlA2 platelet‐specific antibodies were identified and the patient's platelets were typed as homozygous PlA1‐positive and Baka‐negative. The patient also developed red‐cell, granulocyte and lymphocytotoxic antibodies in response to the blood transfusion and had a delayed haemolytic transfusion reaction.