Once considered to be a simple cause-and-effect relationship with localized impact, the concept of how antimicrobial use drives antimicrobial resistance is now recognized as a complex, transdisciplinary problem on a global scale. While the issue of antimicrobial resistance is often studied and addressed at the antimicrobial-human or antimicrobial-animal treatment interface, the role of the environment in the One Health dynamics of antimicrobial resistance is not as well understood. Antimicrobial-resistant bacteria, including those resistant to carbapenem drugs, are emerging in veterinary clinical environments, on farms, and in natural habitats. These multidrug-resistant bacteria can colonize our livestock and companion animals and are later disseminated into the environment, where they contaminate surface waters and colonize wildlife. From here, the One Health transmission cycle of antimicrobial-resistant bacteria is completed as environmental reservoirs can serve as sources of antimicrobial resistance transmission into human or animal healthcare settings. In this review, we utilize a One Health perspective to evaluate how environments become contaminated and, in turn, become reservoirs that can colonize and infect our veterinary species, and how the veterinary field is combating environmental contamination with antimicrobial stewardship regulations and program implementation. The companion Currents in One Health by Parker et al, AJVR, April 2024, addresses the intensive research that justifies this One Health cycle of antimicrobial resistance transmission and emerging techniques that are dissecting the complex interactions at the One Health interface.

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http://dx.doi.org/10.2460/javma.24.01.0056DOI Listing

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