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BACKGROUND: Fetal/neonatal alloimmune thrombocytopenia (FNAIT) is the platelet counterpart of hemolytic disease of the newborn. Most severe cases of FNAIT are caused by antibodies against human platelet antigen-1a (HPA-1a). HPA-1a–negative women giving birth to an HPA-1a–positive child are at risk of becoming HPA-1a–immunized, particularly women who are HLA-DRB3*01:01–positive. The aim of the stud
