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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY
Caption: Bacterial contamination, coloured scanning electron micrograph (SEM). Escherichia coli bacteria in a cell culture. This contamination has come from an unclean water source. These 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. Magnification: x6500 when printed at 10 centimetres across.
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Keywords: bacteria, bacterial contamination, bacteriology, bacterium, biological, biology, coloured, contamination, culture, culutred, dirty, escherichia coli, false-coloured, foul, infected, micro-organism, micro-organisms, microbe, microbiological, microbiology, microorganism, microorganisms, scanning electron micrograph, sem, water supplies
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