DAVID SCHARF / SCIENCE PHOTO LIBRARY DAVID SCHARF / SCIENCE PHOTO LIBRARY
E. coli bacteria. Coloured scanning electron micrograph (SEM) of a colony of Escherichia coli bacteria, a cause of food poisoning. These Gram- negative bacteria are present in the intestinal tract of humans and other animals. They are usually harmless, but cross-contamination through food and other routes can cause diarrhoea and gastroenteritis in humans. Magnification: x6,750 at 6x6cm size.
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