ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2019, Vol. 50 ›› Issue (4): 887-892.doi: 10.11843/j.issn.0366-6964.2019.04.022

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Characterization of Antimicrobial Resistance and Extended-Spectrum β-Lactamase Genes in Bovine Origin Shiga Toxin-producing Escherichia coli in Xinjiang

TONG Panpan, MA Kaiqi, LIU Zhenghui, XIE Jinxin, SU Hong, WANG Dong, SUN Xue, GAO Jiaojiao, SU Zhanqiang*   

  1. College of Veterinary Medicine, Xinjiang Agricultural University, Urumqi 830052, China
  • Received:2018-10-11 Online:2019-04-23 Published:2019-04-23

Abstract:

The objective of this study was to investigate the phenotypic and genotypic basis of bovine Shiga toxin-producing Escherichia coli (STEC) from Xinjiang and obtain the evolution and spread of STECs resistance. Susceptibility testing to 18 antimicrobials was performed on bovine (non-O157:H7)STEC isolates from 6 regions of Xinjiang. Meanwhile, the extended spectrum β-lactamases(ESBL) genes were amplified. In this study 4.31% STEC isolates were multidrug resistant to antimicrobials (MDR), and 1.91% were ESBLs-producing strains. The predominant ESBL genes detected were blaTEM and blaCTX-M. This is the first report of blaTEM and blaCTX-M in STEC isolates in Xinjiang. Most resistant STECs (91.67%) isolated in this study belong to phylogenetic groups A. These findings suggest that MDR STECs are emerging as a result of nonpathogenic E. coli acquiring virulence and resistance genes. This may convey a certain competitive advantage for the colonization of these STECs in cattle when antimicrobial selective pressures are present, potentially leading to an increase in contamination of food with resistant STECs.

Key words: Shiga toxin-producing Escherichia coli, drug resistance, foodborne pathogen, antimicrobial, ESBLs

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