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Blastocystis
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 recognized as a protozoan parasite of humans causing intestinal disease with potentially disabling symptoms.
(Source: National Library of Medicine 2013 MeSH Scope Note and Classification)
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References
  1. National Library of Medicine 2013 MeSH Scope Note and Classification

National Library of Medicine MeSH Classification

Eukaryota
Alveolata
Lobosea
Amoebida
Blastocystina
Blastocystis
Blastocystis hominis