|Description:||Magnified 1150X, this trichrome-stained photomicrograph revealed the presence of a parasitic Dientamoeba fragilis trophozoite.|
Dientamoeba fragilis is a flagellate that must be morphologically differentiated from the small nonpathogenic amebas. D. fragilis has no cyst stage, and its trophozoites measure 5 to 15µm. The flagella are not usually evident and the pseudopodia are angular to broad-lobed and transparent. While most trophozoites are typically binucleate, some have only one nucleus.