Antimicrobial resistance, diversity and class-1 integrons among Salmonella serovars isolated from swine

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2001-01-01
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Gebreyes, Wondwossen
Altier, Craig
Funk, Julie
Davies, Peter
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International Conference on the Epidemiology and Control of Biological, Chemical and Physical Hazards in Pigs and Pork
Iowa State University Conferences and Symposia

The SafePork conference series began in 1996 to bring together international researchers, industry, and government agencies to discuss current Salmonella research and identify research needs pertaining to both pig and pork production. In subsequent years topics of research presented at these conferences expanded to include other chemical and biological hazards to pig and pork production.

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The aim of this study was to determine frequency of antimicrobial resistance, identify and characterize multi-drug resistant Salmonella, determine genetic diversity and characterize class-! integrons. The frequency of resistance wasTe (85%), Am (47%), Pi (32%), Ax (23%), Cm (2 1 %), Gm (2%), Ce (2%) and TSx (I%). Two pentaresistant MDR phenotypes were predominant: AmCmStSuTe (36.2%) and AmKmStSuTe (44.6%). DNA fingerprinting revealed eight clusters of typhimurium and Copenhagen with less than 95% of fragment length identity. DT l 04 with StSu R-type, which carried only one class-1 integron of l .Ok b size, were also found from environmental samples. In addition, we identified class 1 integrons among uncommon serovars including Muenchen, Muenster, Worthington, and Bere. The genetic diversity and p resence of class-1 integrons among diverse serovars further imply the potentia l hazard and spread of multiresistant strains in Salmonella.

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