DAVID M. PHILLIPS / SCIENCE PHOTO LIBRARY DAVID M. PHILLIPS / SCIENCE PHOTO LIBRARY
Colour enhanced scanning electron micrograph (SEM) of E. coli bacteria (in orange). Escherichia coli are Gram-negative, rod-shaped bacteria that are part of the normal flora of the human gut. Some strains produce a toxin that causes severe diarrhoea and can be fatal, especially in the very young or elderly. Magnification 13,000x at 4x4 inches.
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