The first two cases of neonatal alloimmune thrombocytopenia associated with the low‐frequency platelet antigen HPA‐21bw (Nos) in Japan

Abstract

We identified the HPA-21bw allele from two unrelated Japanese infants with severe NAIT. We identified 10 individuals (1.06%) positive for the HPA-21bw allele from a genetic screening of 944 Japanese blood donors.