About 3 years ago, physicians in Quebec noticed an alarming pattern in patients with diarrhea. "All of a sudden, we were having patients so sick that they needed the ICU [intensive-care unit]," says doctor and epidemiologist Sandra Dial. The same illness was also sending patients to the morgue as never before. They weren't succumbing to the ailment that brought them to the hospital. Instead, they seemed to have gotten sick from their antibiotic treatment.
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