DR KARI LOUNATMAA / SCIENCE PHOTO LIBRARY DR KARI LOUNATMAA / SCIENCE PHOTO LIBRARY
E. coli O111 bacteria. Transmission electron micrograph (TEM) of Escherichia coli O111 bacteria. These are enterohaemorrhagic E. coli (EHEC), a dangerous form of the normally benign E. coli bacteria which live in the intestine. Usually transmitted by food poisoning, they can cause life-threatening diarrhoea, intestinal bleeding, kidney failure and disturbances to blood clotting. There are no effective cures for EHEC, but there are treatments for dealing with the symptoms of infection. Another strain of EHEC bacteria is E. coli O157:H7. Magnification: x160,000 at 8x10 inch size.
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