Chilomastix mesnili

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Chilomastix mesnili
Scientific classification
Domain: Eukaryota
(unranked): Excavata
Phylum: Metamonada
Class: Retortamonadea
Order: Retortamonadida
Family: Retortamonadidae
Genus: Chilomastix
Species: C. mesnili
Binomial name
Chilomastix mesnili
(Wenyon, 1910)

Chilomastix mesnili is a non-parasitic[1] member of primate gastrointestinal microflora, commonly associated with but not causing parasitic infections. It is found in about 3.5% of the population in the United States. In addition to humans, Chilomastix is found in chimpanzees, orangutans, monkeys, and pigs. It lives in the cecum and colon. C. mesnili has a similar life style to Giardia lamblia.

Although Chilomastix mesnili is considered non-pathogenic, it often occurs with other parasite infections. C. mesnili may be confused with other pathogenic species during diagnosis. It can create a false positive which would result in unnecessary treatment or a false negative which would withhold necessary treatment.


  1. ^ B. Levecke; P. Dorny; T. Geurden; F. Vercammen; J. Vercruysse (September 2007). "Gastrointestinal protozoa in non-human primates of four zoological gardens in Belgium". Veterinary Parasitology. 148 (3–4): 236–246. doi:10.1016/j.vetpar.2007.06.020. PMID 17656023. 


Schmidt, G. and Roberts, L. 2005. Foundations of Parasitology (7th ed.), New York: McGraw-Hill