CHRIS BJORNBERG / SCIENCE PHOTO LIBRARY CHRIS BJORNBERG / SCIENCE PHOTO LIBRARY
Vibrio cholerae. Coloured Scanning Electron Micrograph (SEM) of Vibrio cholerae, the bacteria that causes cholera. These bacteria are small, comma-shaped rods (bacilli), classed as gram- negative. They spread from person to person by contamination of food or water with faeces, and cause profuse watery diarrhoea after infecting the lining of the small intestine. If untreated, cholera can cause severe dehydration and even death. Victims recover completely if allowed to rest and given plenty of fluids. Cholera is mainly confined to densely populated areas where sanitation is poor. Magnification unknown.
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