Severe complication during remission of Crohn's disease: hemophagocytic lymphohistiocytosis due to acute cytomegalovirus infection.

Introduction: Immunosuppressive therapy is today's standard treatment of patients with moderate to severe inflammatory bowel disease (IBD). The risk for opportunistic infections is increased due to this therapy and is a concern in the management of patient with IBD undergoing such a treatment.

Case Report: In this paper, we describe a case of an acute cytomegalovirus (CMV) infection in a 35-year-old male patient with Crohn's disease being in remission while receiving azathioprine therapy.