E. coli bacteria. Close-up of Escherichia coli colonies (brown) being cultured on an agar growth medium (blue) in a petri dish. E. coli bacteria are n

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E. coli bacteria. Close-up of Escherichia coli colonies (brown) being cultured on an agar growth medium (blue) in a petri dish. E. coli bacteria are normally found in the human intestines. Some strains cause food-poisoning and bloody diarrhoea. These strains can be transmitted to humans from contaminated beef and milk. E. coli can also cause urogenital infections.

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