Definition: a parasitic ameba in the human large intestines; trophozoites are usually 9–14 mcm in diameter; the cysts are usually 8–10 mcm in diameter, uninucleate and somewhat irregular in shape, with a thick wall and a large compact mass of glycogen that stains deeply with a solution of iodine; clinically recognizable amebiasis caused by this organism is rare, with symptoms resembling those of chronic disease caused by Entamoeba histolytica; it is also found in other primates and is the commonest ameba of pigs.
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