Amebiasis is an infection of the large intestine caused by Eantamobea histolytica, a single- celled parasite.
EH exists in two forms during its life cycle; the active parasite( trophozoite) and the dormant parasite (cyst)
trophozoites live among the intestinal contents and feed on bacteria or on the wall of the intestine. When infection begins, the trophozoites may cause diarrhea, which expels from the body. Outside the body, the fragile trophozoites die. When the person doesn't have diarrhea, the trophozoites usually become cysts before leaving the intestine. The cysts are very well, and may spread either directly from person to person or indirectly through foods or water.