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In May 2000, spring floods washed cattle manure into the water wells of Walkerton, Ontario, a farming community of 5,000 people about 90 miles west of Toronto, thereby contaminating the town's water supply. An epidemic of diarrhea followed, sickening half of the population and leaving seven dead. continued...
Photo: Brian Smale
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Reprinted from the HHMI Bulletin,
Spring 2004, pages 24-27.
©2004 Howard Hughes Medical Institute
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