2013
DOI: 10.1128/aem.01419-13
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Longitudinal Study of Distributions of Similar Antimicrobial-Resistant Salmonella Serovars in Pigs and Their Environment in Two Distinct Swine Production Systems

Abstract: The aim of this longitudinal study was to determine and compare the prevalences and genotypic profiles of antimicrobial-resistant (AR) Salmonella isolates from pigs reared in antimicrobial-free (ABF) and conventional production systems at farm, at slaughter, and in their environment. We collected 2,889 pig fecal and 2,122 environmental (feed, water, soil, lagoon, truck, and floor swabs) samples from 10 conventional and eight ABF longitudinal cohorts at different stages of production (farrowing, nursery, finish… Show more

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Cited by 55 publications
(38 citation statements)
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“…This is in comparison to our previous report where we identified from a farm environment in North Carolina a 90-to 100-kb plasmid in a tetracyclineresistant S. Rissen isolate carrying the tet(A) gene (31). This serotype is not common in the U.S. agricultural system and was identified for the first time in North Carolina swine farms in 2009 (42).…”
Section: Figsupporting
confidence: 53%
“…This is in comparison to our previous report where we identified from a farm environment in North Carolina a 90-to 100-kb plasmid in a tetracyclineresistant S. Rissen isolate carrying the tet(A) gene (31). This serotype is not common in the U.S. agricultural system and was identified for the first time in North Carolina swine farms in 2009 (42).…”
Section: Figsupporting
confidence: 53%
“…Salmonella isolates from temporally and spatially (originating from multiple counties in North Carolina) related pigs (n = 386), swine environment (n = 536) and human clinical cases (n = 572) were isolated and characterized for their antimicrobial susceptibility, resistance determinants and fingerprint profile (Keelara et al, 2013(Keelara et al, , 2014. The Salmonella isolates from pigs and their environment were collected as part of longitudinal study conducted from October 2008 to December 2011 on 30 conventional farms at different stages of production from farm to slaughter, including once at farrowing (7-10 day old), twice at each of nursery (4 and 7 weeks of age) and finishing stages (16 and 26 weeks of age), and finally once at slaughter in North Carolina.…”
Section: Origin Of Salmonella Isolatesmentioning
confidence: 99%
“…Previously we reported Salmonella prevalence, AMR profile, common MDR patterns, molecular characterization of resistance determinants and genotypic similarity among Salmonella isolates from humans, pigs and the swine environment at various stages of production (Keelara et al, 2013(Keelara et al, , 2014. Based on genotypic and phenotypic results, we were interested in determining whether different Salmonella serotypes with multiple resistance pattern (including MDR) harbor or exchange similar and/or different plasmids within temporally and spatially related MDR Salmonella serotypes in humans, pigs and the swine environment.…”
mentioning
confidence: 99%
“…These studies fall into three major categories: (1) the experimental study, which measures the effects of specified treatments under controlled environments. This type of study can be traced back many decades and a very short list finds research on feeds and their impacts on reducing survival of Salmonella (Hansen, 2004), the impacts of transportation and related stress (Mulder, 1995;Warriss, Brown, Edwards, Anil, & Fordham, 1992), the impacts of polishing process (Hald, Wingstrand, Swanenburg, von Altrock, & Thorberg, 2003), and so forth; (2) the cohort study, which, following the life span of a herd of livestock, examines the effectiveness of mitigation strategies in multiple phases of pre-harvest practices (Hurd, McKean, Wesley, & Karricker, 2001;Keelara et al, 2013;Pires, Funk, Manuzon, Darr, & Zhao, 2013;Rostagno, Hurd, & McKean, 2012;van Winsen et al, 2002); and (3) the farm-to-table study, which explores the entire meat supply chain, including both the pre-and post-harvest practices, for solutions to mitigating pathogens shedding and reducing social costs (FAO/WHO, 2002;Hope et al, 2002;McNamara, Miller, Liu, & Barber, 2007;Miller, Liu, McNamara, & Barber, 2005;Nauta, van der Fels-Klerx, & Havelaar, 2005;Nauta et al, 2009;Roberts, Ahl, & McDowell, 1995;Romero-Barrios, Hempen, Messens, Stella, & Hugas, 2013;Smid, Verloo, Barker, & Havelaar, 2010;Smith, Fazil, & Lammerding, 2013;VLA, 2011;USDA 1998).…”
Section: Introductionmentioning
confidence: 99%