Abstract
The Case Record contributed by Hohmann et al. (Aug. 14 issue),1 regarding a man with ulcerative colitis in whom bloody diarrhea developed soon after fecal microbiota transplantation (FMT), highlights the difficulty in distinguishing cytomegalovirus (CMV) as a direct cause of disease from its being an “innocent bystander” in patients with CMV infection and active ulcerative colitis. However, the authors also reported an apparent case of diarrheal disease caused by Blastocystis hominis transmitted by means of FMT without describing the complex debate as to whether this organism is a true enteropathogen.

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