In the United States,15 to 20 outbreaks annually owing to waterborne pathogens cause this illness and affect several thousand people.

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These outbreaks can be due to Giardia lamblia,Escherichia coli,the Norwalk virus,Norwalk-like viruses,and other viruses associated with diarrhea.Hepatitis C is a blood-borne pathogen.Infection with Naegleria affects the brain and is relatively rare.Legionnaire's disease is a respiratory illness.

In the United States,15 to 20 Outbreaks Annually Owing to Waterborne