Causes of E. coli infection

Most strains of E. coli are harmless. However, one group, including 0157:H7, produces a potent toxin - Shiga toxin - that is harmful for the lining of the small intestine.

Humans can becomeinfected by: SIngesting contaminated water - even though tap water contains chlorine and has undergone ozone or ultraviolet treatment, some E.

colioutbreaks have been caused by contaminated municipal water supplies.

S Ingesting contaminated food - examples include ground beef, unpasteurized milk, or fresh vegetables.

S Having physical contact with an infected person, known as person-to-person contact.

S Contact with animals