DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Entamoeba histolytica, dividing trophozoite with lobopodial extensions, coloured scanning electron micrograph (SEM). A parasitic amoeba that causes amoebic dysentery & ulcers (vegetative trophozoite stage). The amoeba moves by cytoplasmic extrusions or extensions and lobopodia. They invade the intestine but 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 amoeba seen here. New cysts are carried out of the body in the faeces. Entamoeba histolytica occurs worldwide, with up to 50% of the population being infected with it primarily in warmer climates. Amoebic dysentery is spread by faecal contamination of food and water and is most common where sanitation is poor. Magnification: x700 when shortest axis printed at 25 millimetres.
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