c diff, a bacteria that is unfortunately spread these days in hospital settings, causes extended bouts of diarrhea that can indeed be deadly if not treated.
The treatment that you need, besides antibiotics to kill the infection, is rehydration. That’s not a big deal if you A) have a clean water supply to drink from, along with a way to eat or drink electrolytes and other nutrients you need, or B) can go to the hospital and get IV fluids to rehydrate rapidly, bypassing your digestive system.
Those are not universally available options. For people too embarrassed or stubborn to go get help, diarrhea can be a serious risk. Where those resources are lacking entirely, diarrhea is still a very deadly risk.
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