Acta Veterinaria et Zootechnica Sinica ›› 2021, Vol. 52 ›› Issue (12): 3660-3668.doi: 10.11843/j.issn.0366-6964.2021.012.032

• RESEARCH NOTES • Previous Articles     Next Articles

Phylogenetic Clustering, Serotype, Virulence Genes and Drug Resistance Analysis of Shiga Toxin-producing Escherichia coli from Cattle, Sheep and Camel in Xinjiang

TONG Panpan, ZHANG Mengmeng, CHEN Wenxia, LIU Luyao, ZHANG Ling, TANG Xuelin, SU Zhanqiang, XIE Jinxin*   

  1. College of Veterinary Medicine, Xinjiang Agricultural University, Urumqi 830052, China
  • Received:2021-02-21 Online:2021-12-25 Published:2021-12-22

Abstract: This study was conducted to examine the distribution of phylogenetic clustering, serotype, virulence genes, drug resistance and genetic diversity of Shiga toxin-producing Escherichia coli (STEC) from cattle, sheep and camel in Xinjiang. Phylogenetic clustering, serotype and virulence genes stx1, stx2 (including subtypes), eaeA and hlyA of STEC isolates were tested by PCR method from cattle, sheep and camel, drug sensitivity of isolates was determined by using a Kirby-Bauer disk diffusion method and genotypical analysis was performed by enterobacterial repetitive intergenic consensus (ERIC) polymerase chain reaction (PCR). The results showed that 94 of non-O157 STEC isolates which were mainly B1 group and contained 9 serum groups, including O146 (n=14), O22 (n=7), O3 (n=4), O168 (n=4), O8 (n=3), O167 (n=2), O88 (n=1), O112ab (n=1) and O147 (n=1). The virulence gene test of showed that 46.8% (44/94) carried stx1 only, 6.4% (6/94) for stx2 only, and 46.8% (44/94) carried both stx1 and stx2. STEC isolated from sheep and camel mainly carried stx1+hlyA (68.0% and 25.0%, respectively), while STEC isolated from cattle mainly carried stx1+stx2+hlyA (57.9%). stx1awas mainly distributed in bovine STEC and stx1cwas mainly distributed in STEC of sheep. Fourteen strains (14.9%) were drug-resistant, and the drug resistance rates of STEC isolates to ceftazidime, tetracycline, cefotaxime, ampicillin and amtronam ranged from 3.2% to 5.3%, to cotrimoxazole, cefepime, piperacillin-tazobactam, ampicillin-sulbactam, amoxicillin-clavulanate and polymyxin B ranged from 1.1% to 2.1%. ERIC-PCR results showed that STEC from cattle, sheep and camel were closely related. Cattle, sheep and camels carry a variety of known serotypes of STEC and store abundant virulence genes, which may potentially infect human beings. Therefore, it is necessary to prevent and control the contamination of meat during slaughtering and processing.

Key words: Shiga toxin-producing Escherichia coli, ruminants, virulence gene, drug resistance, ERIC-PCR

CLC Number: