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Gut Pathogens
Published in: Gut Pathogens 1/2016

Open Access 01-12-2016 | Research

Molecular epidemiology, virulence determinants and antimicrobial resistance of Campylobacter spreading in retail chicken meat in Central China

Authors: Tengfei Zhang, Qingping Luo, Yiluo Chen, Tingting Li, Guoyuan Wen, Rongrong Zhang, Ling Luo, Qin Lu, Diyun Ai, Hongcai Wang, Huabin Shao

Published in: Gut Pathogens | Issue 1/2016

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Abstract

Background

Campylobacter species are the major food-borne pathogens which could cause bacterial gastroenteritis in humans. Contaminated chicken products have been recognized as the primary vehicles of Campylobacter transmission to human beings. In this study, the prevalence of Campylobacter in retail chicken meat in Central China was investigated, and the isolates were further characterized using molecular approaches and tested for antibiotic resistance.

Results

A total of 302 chicken samples purchased from April 2014 to April 2015 were tested. The level of Campylobacter contamination was enumerated by most probable number-PCR (MPN-PCR). The Campylobacter positive rate was 17.2% (52/302), with bacterial count varying from 3.6 to 360 MPN/g in positive samples. A total of 52 Campylobacter strains, including 40 Campylobacter jejuni and 12 Campylobacter coli, were isolated from the positive samples. To examine the genetic diversity of the isolates, multilocus sequence typing (MLST) technology was applied, which identified 23 sequence types (STs) belonging to seven clonal complexes (CCs) and unassigned. Among them, the dominant CCs of C. jejuni included CC-353 and CC-464, and the dominant CCs of C. coli were CC-828 and CC-1150. Antibiotic resistance analysis showed that all of the isolates were resistant to norfloxacin and ciprofloxacin. 23 virulence-associated genes were tested in the isolates, which showed that the number of virulence-associated genes detected in the C. jejuni isolates ranged from 16 to 21, while in most of the C. coli isolates ranged from 12 to 16. Virulence-associated genes, flaA, flgB, flgE2, fliM, fliY and cadF were detected in all isolates. VirB11, however, was not detected in any of the isolates.

Conclusions

To the best of our knowledge, this is the first report on the contamination level and molecular biological features of Campylobacter strains in retail chicken meat in Central China, which showed high genetic diversity and remarkable antibiotic resistance. This study provided scientific data for the risk assessment and evaluation of Campylobacter contamination in retail chicken products.
Appendix
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Metadata
Title
Molecular epidemiology, virulence determinants and antimicrobial resistance of Campylobacter spreading in retail chicken meat in Central China
Authors
Tengfei Zhang
Qingping Luo
Yiluo Chen
Tingting Li
Guoyuan Wen
Rongrong Zhang
Ling Luo
Qin Lu
Diyun Ai
Hongcai Wang
Huabin Shao
Publication date
01-12-2016
Publisher
BioMed Central
Published in
Gut Pathogens / Issue 1/2016
Electronic ISSN: 1757-4749
DOI
https://doi.org/10.1186/s13099-016-0132-2

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