Case Presentation: A 49-year-old man with a history of ulcerative colitis presented to the emergency department (ED) with progressive symptoms of fever, myalgias, night sweats, and diffuse abdominal pain. He recently completed a course of ciprofloxacin, metronidazole, and prednisone after developing fever following his infliximab infusion. In ED, his physical exam was unrevealing. Laboratory results [...]