A modern person’s experience of diarrhea is different from a person living in a time or place with poor sanitation. Illness from spoiled food can make life unpleasant for a day or two, but usually once the food (and the bacteria in it) has cleared your system, you get back to normal.
Diseases like cholera and dysentery instead come from water contaminated with sewage. They cause much longer bouts of diarrhea lasting weeks or months, which can induce severe dehydration and death. You may also keep reintroducing the disease into your system if you don’t understand that you’re getting it from the water supply.
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