ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (1): 177-182.doi: 10.11843/j.issn.0366-6964.2016.01.024

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Detection of Virulence Genes and Antimicrobial Resistance Analysis of Escherichia coli Isolated from Dairy Cow Mastitis in Ningxia

ZHANG Jin-bao1,MA Chun-fang2,YU Ting1,LI Xiao-na1,WEI Xiao-ping3,WANG Gui-qin1*   

  1. (1.College of Agriculture,Ningxia University,Yinchuan 750021,China;2.College of pharmacy,Ningxia Medical University,Yinchuan 750004,China;3.Technology Bureau of Hongsipu Agricultural and Animal Husbandry,Wuzhong 751999,China)
  • Received:2015-06-08 Online:2016-01-23 Published:2016-01-23

Abstract:

The objectives of this study were to investigate resistance,virulence genes and resistance genes of Escherichia coli isolated from dairy cow mastitis in Ningxia.The antimicrobial resistance of 197 Escherichia coli from dairy cow mastitis cases to 16 drugs was determined by the methods of K-B and the virulence genes and resistance genes were detected by PCR.The results showed that the resistance rate of ampicillin was the highest and it achieved 54.69%.Furthermore,the resistance rates of doxycycline,tetracycline and streptomycin were about 39%.It was more sensitive to cephazolin,cefotaxime,polymyxin,florfenicol,quinolones,and the sensitive rates were above 60%.The results of genes detection showed that the detection rates of virulence genes astAescVeaeAsepAhlyA were 20.30%,14.72%,8.12%,2.03% and 1.02% respectively.The virulence genes sta and stx2e were not detected.Tetracycline resistant genes were detected and the detection rate of tetC was 24.87%.The detection rate of fluoroquinolone resistance genes GyrAGyrB and ParC were 97.46%,98.98% and 98.48%,respectively.Our study demonstrates Escherichia coli isolates from dairy cow mastitis in Ningxia carrying virulence genes astAeaeAsepAescVhlyA and the genes mediate resistance to tetracyclines,fluoroquinolones,and those isolates have varying degrees of resistance 16 kinds of antibacterial drugs,and some isolates are multi-resistant strains.

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