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Asymptomatic carriers are a potential source for transmission of epidemic and nonepidemi c Clostridium difficile strains among long-term care facility residents.

The epidemiology of community-acquired Clostridium difficile infection: a population-based study. Incidence of and risk factors for community-associated Clostridium difficile infection: a nested case-control study. Risk factors for and estimated incidence of community-associated Clostridium difficile infection, North Carolina, USA.