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  1. Cyst Trophozoite; Entamoeba histolytica: Pathogenic: 10–20 µm, peripheral, fine evenly distributed chromatin; 2–4 nuclei with small central karyosome12–60 µm, may have red blood cells within cytoplasmEntamoeba coli: Nonpathogenic, larger than E. histolytica

  2. •Balantidium Coli •Balantidium coli is the largest protozoan parasite in humans and causes a disease called balantidiasis. It belongs to the ciliophora phylum and is the only protozoan ciliate to infect humans. •It goes through two development phases; a cyst and a trophozoite. Trophozoites are 0.03–0.15 mm long and 0.025–0.12 mm wide.

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