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Medical Definition of Blastocystis hominis
1. A species of parasitic protozoa found in the intestines of humans and other primates. It was classified as a yeast in 1912. Over the years, questions arose about this designation. In 1967, many physiological and morphological b. Hominis characteristics were reported that fit a protozoan classification. Since that time, other papers have corroborated this work and the organism is now recognised as a protozoan parasite of humans causing intestinal disease with potentially disabling symptoms. (12 Dec 1998)