, more than 2,300 people were sickened by E. coli and seven died after drinking tainted water in Walkerton, Ont., in 2000.
E. coli mostly causes gastrointestinal woes like diarrhea, vomiting and cramps. But there are more serious strains, such as E. coli 0157, which secretes Shiga toxins that can lead to an uncommon but serious complication called hemolytic uremic syndrome , which can damage organs.
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