Flooding after two weeks of heavy rainfall in Tooele, Utah, preceded a high rate of diarrheal illness. Giardia intestinalis was isolated from 25% of the patients. A comparison study of a town 65 miles away revealed that were was diarrheal illness in 2.9% of the 103 people interviewed. Tooele has a municipal water system and a municipal sewage treatment plant. Explain the probable cause of this epidemic and method(s) of stopping it. What would a fecal coliform test have shown?
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