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Arthur R. Russo, MD; Sarah L. Stone, MD; Mary Ellen Taplin, MD; Howard J. Snapper; Gary V. Doern, PhD

Arch Intern Med. 1988;148(5):1064.

Abstract
• A patient with persistent diarrhea was found to have biopsy-proved colitis with large numbers of the protozoan Blastocystis hominis present in stool. Extensive evaluation failed to reveal any other potential etiologic agent of acute colitis. Following treatment with a course of metronidazole, the patient became asymptomatic, B hominis was no longer present in stool, and results of a repeated biopsy were normal. These observations are consistent with the role of B hominis as a gastrointestinal pathogen.

(Arch Intern Med 1988;148:1064)

Author Affiliations
From the Departments of Medicine (Drs Russo, Stone, and Taplin and Mr Snapper) and Clinical Microbiology (Dr Doern) and the Division of Infectious Diseases (Dr Doern), University of Massachusetts Medical Center, Worcester.

Footnotes
Accepted for publication Dec 5, 1987.

Reprint requests to Department of Medicine, University of Massachusetts Medical Center, 55 Lake Ave N, Worcester, MA 01655 (Dr Russo).

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