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Dientamoeba fragilis

Dientamoeba fragilis is a parasite that lives in the large intestine of people. This protozoan parasite produces trophozoites; cysts have not been identified. The intestinal infection may be either asymptomatic or symptomatic.

Image: Binucleate (left) and uninucleate (right) trophozoites of D. fragilis, stained with trichrome. (Credit: DPDx).