Escherichia coli O157, also known as Shigatoxigenic Escherichia coli (STEC, previously known as verotoxigenic or VTEC), is a serogroup of the family of bacteria Escherichia coli. STEC infection is a relatively rare cause of gastrointestinal illness.
E. coli O157 is found in the gut and faeces of many animals, particularly cattle.
