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Escherichia coli (commonly abbreviated E coli) is a Gramnegative, rodshaped bacterium that is commonly found in the lower intestine of warmblooded organisms (endotherms) Most E coli strains are harmless, but some serotypes can cause serious food poisoning in humansE coli is a rodshaped bacterium The peptidoglycan cell wall is thin and multilayered There is a thin peptidoglycan layer placed between the inner cytoplasmic membrane, and the outer membrane The outer membrane is surrounded by the capsule layer which is composed of polysaccharidesEscherichia coli (or simply E coli) is one of the many groups of bacteria that live in the intestines of healthy humans and most warmblooded animals E coli bacteria help maintain the balance of normal intestinal flora (bacteria) against harmful bacteria and synthesize or produce some vitamins Escherichia Coli E Coli National Geographic Society Escherichia coli e coli shape