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Blastocystis hominis Infection Presenting as Recurrent Diarrhea

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▸Requests for reprints should be addressed to Jerry B. Vannatta, M.D.; Presbyterian Hospital, Medical Education Department, Northeast 13th at Lincoln Boulevard; Oklahoma City, OK 73104.

Presbyterian Hospital and the University of Oklahoma College of Medicine; Oklahoma City, Oklahoma

Ann Intern Med. 1985;102(4):495-496. doi:10.7326/0003-4819-102-4-495
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Originally named and classified as fungus by Brumpt (1), Blastocystis hominis has recently been reclassified as a parasite (2). In addition, B. hominis has recently been reported as pathogenic (3), although it had been thought to be a commensal in humans. We report a case of recurrent diarrhea, thought to be caused by B. hominis.

A 28-year-old white man had episodes of vomiting and diarrhea, occurring 1 day per week for 3 successive weeks. The symptoms lasted approximately 18 hours on each of these days, after which he felt well. He had weakness and generalized cramping during these episodes, but


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