E. Coli

Escherichia coli, a subgroup of fecal coliform bacteria that is
present in the intestinal tracts and feces of warm-blooded
animals. It is used as an indicator of the potential presence of
pathogens. There are many different strains of E. coli that are
classified into more than 170 serogroups. Although most strains
of E. coli are harmless and live in the intestines of healthy
humans and animals, the E. coli O157:H7 strain produces a
powerful toxin and can cause severe illness.