50.0 MB (3.7 MB compressed)
4825 x 3619 pixels
40.9 x 30.7 cm ⏐ 16.1 x 12.1 in (300dpi)
MARTIN OEGGERLI / SCIENCE PHOTO LIBRARY MARTIN OEGGERLI / SCIENCE PHOTO LIBRARY
Escherichia coli bacteria, coloured scanning electron micrograph (SEM). E. coli bacteria are a normal part of the intestinal flora in humans and other animals, where they aid digestion. However, some strains, for instance E. coli O157, can produce a toxin that leads to severe illness, or even death. Normal strains can also produce infections in weakened or immunosuppressed people.
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