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Amoebic dysentry. Light micrograph of Entamoeba histolytica amoebae (round, pale blue) invading the lining of the large intestine (colon). These protozoa cause amoebic dysentery and ulcers. They may spread to the liver, lungs and other tissues, causing abscesses to develop. Infection is caused by the ingestion of cysts in contaminated food or water. The cysts develop into the pathogenic trophozoite forms seen here. New cysts are carried out of the body in the faeces. E. histolytica occurs worldwide, with up to 50% of the population being infected with it in hot regions with poor sanitation. Magnification: x1600 at 5x7cm size.
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