E. coli bacterium strain O157:H7,coloured transmission electron micrograph (TEM). E. coli are Gram-negative rod-shaped bacteria that are part of the normal flora of the human gut. Although most are harmless,some strains produce a toxin that causes severe diarrhoea and can be fatal. E. coli O157:H7 is an enterohemorrhagic strain,which causes bloody diarrhoea,and occasionally kidney failure,especially in young children and elderly people | |
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Credit: | Science Photo Library / AMI Images |
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