Potentially pathogenic … Enterohemorrhagic Escherichia coli (EHEC) serotype O157:H7 is a human pathogen responsible for outbreaks of bloody diarrhea and hemolytic uremic syndrome (HUS) worldwide. Pathogenic strains of E. coli are responsible for three types of infections in humans: urinary tract infections (UTI), neonatal meningitis, and intestinal diseases (gastroenteritis). Conventional antimicrobials trigger an SOS response in EHEC that promotes the release of the potent Shiga toxin that is responsible for much of the morbidity and mortality associated with EHEC infection. Diseases caused by E. coli are: Urinary tract infections (UTI) Gram-negative rod sepsis Neonatal meningitis Traveler’s diarrhea (watery diarrhea) Enterohemorrhagic strains of E.coli (i.e. Pathogenic bacteria contaminating the environment are ingested by susceptible animals and enter the... EPEC. STEC Edema disease. Pathogenic bacteria contaminating the environment are ingested by susceptible animals and enter the intestinal... ExPEC.