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Prevalence of Class 1 Integrons and Antimicrobial Resistance Gene Cassettes among Enteric Bacteria Found in Multisite Group-Level Cohorts of Humans and Swine

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The prevalence of antimicrobial resistance genotypic characteristics (class 1 integrons and antimicrobial resistance gene cassettes) among commensal Escherichia coli isolated from humans and swine in a semiclosed, integrated farrow-to-fork population was evaluated in a cross-sectional study. The objective of this study was to establish baseline antimicrobial resistance patterns of enteric bacteria from animals and humans within the study population; specifically, genotypic traits both unique and common to commensal E. coli derived from the different sources were evaluated. There were significant differences between host species; swine isolates were more likely to harbor integrons (odds ratio = 2.33, P = 0.0487). No significant differences were found for facility location, facility type, human housing cohort, or time of day (P > 0.05). There were significant differences (P = 0.006) among swine production groups (fecal samples from boars, dry sows, finishers, growers, intake boars, lactating sows, the lagoon, nursery piglets, influent, and piglets); the grower group was less likely than the nursery group to harbor a class 1 integron (nursery as referent: odds ratio = 0.22, P = 0.04). Among all isolates with an integron present, human isolates were more likely to harbor an antimicrobial resistance gene cassette (odds ratio = 6.36, P = 0.003). When isolates that possessed gene cassettes coding for resistance to specific antimicrobials were compared, no significant differences between host species (P > 0.05) were observed.

Document Type: Research Article

Affiliations: 1: Department of Veterinary Integrative Biosciences, College of Veterinary Medicine, Texas A&M University, College Station, Texas 77843-4458, USA 2: Food and Feed Safety Research Unit, U.S. Department of Agriculture, Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, Texas 77845, USA; Bioproducts and Biocatalysis Research Unit, U.S. Department of Agriculture, Agricultural Research Service, National Center for Agricultural Utilization Research, Peoria, Illinois 61604, USA 3: Food and Feed Safety Research Unit, U.S. Department of Agriculture, Agricultural Research Service, Southern Plains Agricultural Research Center, College Station, Texas 77845, USA

Publication date: December 1, 2005

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