Analyses of prevalence and molecular typing reveal the spread of antimicrobial-resistant Salmonella infection across two breeder chicken farms - PubMed (original) (raw)

. 2018 Dec 1;97(12):4374-4383.

doi: 10.3382/ps/pey305.

Kequan Yin 1 2, Chao Yin 1 2, Yachen Hu 1 2, Jingwen Li 1 2, Zihao Zhou 1 2, Yuqi Tian 1 2, Shizhong Geng 1 2, Xiang Chen 1 2 3, Zhiming Pan 1 2 3, Qiuchun Li 1 2 3, Xinan Jiao 1 2 3

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Analyses of prevalence and molecular typing reveal the spread of antimicrobial-resistant Salmonella infection across two breeder chicken farms

Xiao Fei et al. Poult Sci. 2018.

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Abstract

In this study, Salmonella prevalence and antimicrobial resistance were evaluated at various production stages in 2 geographically separated breeder farms (referred to as G and F). Day-old chicks for the breeder flock at farm F were purchased from farm G. A total of 219 Salmonella isolates, all identified as Salmonella enterica subsp. enterica serovar Enteritidis, were recovered from 1,430 samples (sick chicken carcasses and/or dead embryos). The isolation rates at breeder farms G and F were 10.53% (56/532) and 18.15% (163/898), respectively. Resistance to 4-6 antimicrobial agents was the most frequent phenotype during the laying stage at both farms, suggesting that chicks are exposed to higher risk of antimicrobial-resistant Salmonella infection during this stage of the breeding process. Using clustered regularly interspaced short palindromic repeat (CRISPR) typing, 5 CRISPR patterns were identified, out of which one pattern was shared by the 2 farms. In addition, pulsed-field gel electrophoresis (PFGE) typing result indicated that 2 clusters (PF-1 and PF-2) were shared among the 2 breeder farms, suggesting that strains were transmitted from breeder farm G to farm F via the trade of day-old chicks. Our findings suggested that the trade of day-old breeder chicks could be one of the potential Salmonella transmission routes, and antibiotics should be administered with caution during the laying stage.

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