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Where do the microbes that cause E. coli 0157, Giardia, and Cryptosporidium poisoning come from?

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Where do the microbes that cause E. coli 0157, Giardia, and Cryptosporidium poisoning come from?

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E. coli O157:H7 E. coli O157:H7 is one of hundreds of strains of the bacterium Escherichia coli. Although most strains are harmless, this strain produces a powerful toxin and can cause severe illness. E. coli live in the intestines of healthy humans and animals. Most illnesses are associated with the consumption of undercooked, contaminated ground beef, but can also be contracted through drinking sewage-contaminated water. Person-to-person contact in families and day care centres is another mode of E. coli transmission. Giardia Giardia is a parasite that can be contracted by drinking water from lakes or streams where water-dwelling animals such as beavers and muskrats, or where domestic animals such as cattle or sheep, have caused contamination. It is also spread by direct person-to-person contact. Giardia outbreaks can also occur in communities where water supplies become contaminated with insufficiently treated wastewater. Cryptosporidium Cryptosporidium is a parasitic disease-causin

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