The infections often strike the elderly, especially those who've been taking antibiotics that clear out competing bacteria in people's intestines. People sickened by the bug have persistent diarrhea that can, in severe cases, lead to dehydration.
C. diff, as it's known, is resistant to common broad-spectrum drugs and used to lurk mainly in hospitals. But as NPR's Rob Stein reported in March, more and more people are contracting C. diff elsewhere.
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