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Authors: Peng, Zixin and Zou, Mingyuan and Li, Menghan and Liu, Danru and Guan, Wenying and Hao, Qiong and Xu, Jin and Zhang, Shuhong and Jing, Huaiqi and Li, Ying and and Liu, Xiang and Yu, Dongmin and Yan, Shaofei and Wang, Wei and Li, Fengqin

Yersinia enterocolitica is an enteropathogen transmitted by contaminated food. In this study, a total of 500 retail poultry meat samples from 4 provinces and 145 swine feces samples from 12 provinces in China was tested for Y. enterocolitica and 26 isolates were obtained for further bio-serotyping, testing with antimicrobial susceptibility testing to a panel of antimicrobial compounds, and genetically characterization based on the whole genome sequencing. Higher prevalence (4.8%) of Y. enterocolitica contamination in retail poultry meat than that in swine feces (2.76%) was observed. No difference in bio-serotypes, multilocus sequence typing (MLST) and virulence genes distribution between swine and poultry origin were found. All isolates were resistant to ampicillin, amoxicillin/clavulanic acid, and cefazolin and were multi-drug resistant (MDR). The most predominant drug-resistance profile was AMP-CFZ-AMC-FOX (42.31%). A pathogenic isolate with bio-serotype 3/O:3 and ST135 was cultured from retail fresh chicken meat for the first time in China. Based on the whole-genome single nucleotide polymorphisms (SNPs) tree analysis, pathogenic isolates clustered closely, while nonpathogenic isolates exhibited high genetic heterogeneity. These indicated that pathogenic isolates were conserved on genetic level. The whole-genome SNP tree also revealed that Y. enterocolitica of swine, chicken and duck origin may share a common ancestor. The findings highlight the emergence of drug-resistant pathogenic Y. entrocoliticas in retailed poultry meats in China.

Journal: Food control
DOI: 10.1016/j.foodcont.2018.05.048
Year: 2018

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