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Enteromonas hominis, a nonpathogenic flagellate.
Both cysts and trophozoites of Enteromonas hominis are shed in feces . Infection occurs after the ingestion of cysts in fecal-contaminated food or water, or on fomites . In the large (and possibly small) intestine, excystation releases trophozoites. Enteromonas resides in the large intestine, where it is regarded as a commensal and is not known to cause disease.
Enteromonas hominis is considered nonpathogenic. The presence of cysts and/or trophozoites in stool specimens can however be an indicator of fecal contamination of a food or water source, and thus does not rule-out other parasitic infections.