Multiple Alloantibodies after Transfusion in an Infant Treated with Infliximab

Abstract
Infliximab (Remicade) is a humanized mouse monoclonal antibody that blocks tumor necrosis factor α.1 It down-regulates type 1 helper T-cell (Th1) immune responses and increases type 2 helper T-cell (Th2) responses, thereby favoring antibody production.2 There are many reports of autoantibody formation after the administration of infliximab, including a case of autoimmune hemolytic anemia.1 We report on a 10-month-old boy who received infliximab for systemic-onset juvenile rheumatoid arthritis and who had a severe hemolytic transfusion reaction.