Fatal transfusion-transmitted infection due to Citrobacter koseri.

Background: Transfusion-transmitted bacterial infection (TTBI) is still one of the most feared complications of blood transfusion.

Case Report: We report a fatal case involving an 8-year-old child with congenital dyskeratosis complicated by severe aplastic anemia who was regularly transfused with platelet (PLT) concentrates for 5 years. The patient received an apheresis PLT concentrate (APC) on Day 0 due to thrombocytopenia complicated by mucocutaneous hemorrhage.