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Entamoeba coli, E. hartmanni, E. polecki, Endolimax nana, and Iodamoeba buetschlii are generally considered nonpathogenic and reside in the large intestine of the human host . Both cysts and trophozoites of these species are passed in stool and considered diagnostic .
Entamoeba coli is a type of protozoan parasite that primarily resides in the large intestine of humans. Unlike its pathogenic counterpart, Entamoeba histolytica, Entamoeba coli does not invade the intestinal tissues or cause severe illness. It is primarily acquired through the ingestion of food or water contaminated with the parasite.
Aug 23, 2023 · Mature Entamoeba coli Cyst. This trichrome-stained photomicrograph depicts a mature Entamoeba coli cyst containing five clearly visible nuclei and what may have been a sixth nucleus, which was outside the focal plane and, therefore, out of focus. The cyst also contained a visible chromatoid body.
Key Points. Amebiasis is infection with Entamoeba histolytica. It is acquired by fecal-oral transmission. Infection is commonly asymptomatic, but symptoms ranging from mild diarrhea to severe dysentery may occur. Extraintestinal infections include liver abscesses. Diagnosis is by identifying E. histolytica.
Aug 23, 2023 · Entamoeba coli is one of many non-pathogenic protozoa found in humans. It is transmitted through fecal-oral contact, and the mature cyst can be found in contaminated water. Typically, these protozoa inhabit the large intestinal tract and can be identified in diagnostic stool specimens.
Cysts are 10–35 μm in diameter. Immature cysts typically have a large glycogen vacuole and two nuclei. Mature cysts have eight nuclei, with hypernucleate forms having 16 or more nuclei. The presence of an Entamoeba cyst in human stool with more than four nuclei is pathognomonic for E. coli ( Ash and Orihel, 2007 ).
There is no known cyst stage for Entamoeba gingivalis; trophozoites live in the oral cavity of humans, residing in the gingival pockets near the base of the teeth . They are not considered pathogenic, and feed on bacteria and other debris. Trophozoites are transmitted person-to-person orally by kissing or fomites (such as eating utensils) .
