Entamoeba histolytica

Entamoeba histolytica. Trophozoites in fecal smear (trichrome stain, oil immersion). This cluster of trophozoites was seen in a patient with amebic dysentery. In two of the organisms the typical nuclear morphology is clearly evident, in a third organism the nucleus is slightly out of focus, and in the fourth the nucleus is not in the plane of focus. A single red blood cell is seen within the cytoplasm of two of the amebae.