JUERGEN BERGER / SCIENCE PHOTO LIBRARY JUERGEN BERGER / SCIENCE PHOTO LIBRARY
E. coli bacteria. Coloured scanning electron micrograph (SEM) 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 unknown.
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