Ulcerative Proctitis in a Patient With a History of Fecal Microbiota Transplant for Clostridioides difficile Infection

Fecal microbiota transplantation (FMT) effectively treats Clostridioides difficile infection and alters the gut microbiota in the long term, but potential adverse effects are poorly understood. We report a man with a family history of ulcerative colitis who developed ulcerative proctitis within a year of FMT.