Clostridioides difficile (C. difficile) is a spore-forming, toxin-producing, anaerobic bacterium infecting the human gastrointestinal tract, causing diarrhea and life-threatening colitis. C. difficile epidemiology continues to evolve, and it is recognized as a major community-associated pathogen in addition to its established role in causing healthcare-associated infection. While current surveillance and prevention measures mainly focus on healthcare-associated C. difficile infections, much less is known about the factors driving community-associated C. difficile infections. This review highlights the potential contribution of reservoirs, including asymptomatic carriers, to community-associated C. difficile transmission. The reservoirs discussed in this review provide potential avenues for research to better understand and reduce community-associated transmission of C. difficile.
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