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Pentatrichomonas hominis

[Pentatrichomonas hominis]

Trophozoites of P. hominis in a stool specimen, stained with trichrome.

Trophozoite of P. hominis in a stool specimen, stained with trichrome.


 Trophozoites of P. hominis in a stool specimen, stained with trichrome.

Trophozoite of P. hominis in a stool specimen, stained with trichrome.

Causal Agents

Pentatrichomonas hominis, a nonpathogenic flagellate.


Life Cycle

Life cycle of Pentatrichomonas

Only trophozoites of Pentatrichomonas hominis are shed in feces The number 1, as there is no known cyst stage for this species. Infection occurs after the ingestion of trophozoites in fecal-contaminated food or water, or on fomites The number 2. Pentatrichomonas resides in the large intestine, where it is regarded as a commensal and is not known to cause disease.

Geographic Distribution

Worldwide

Clinical Presentation

Pentatrichomonas hominis is considered nonpathogenic. The presence of 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.

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  • Page last reviewed November 29, 2013
  • Page last updated November 29, 2013
  • Content source: Global Health - Division of Parasitic Diseases and Malaria
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