Journal of Integrative Agriculture ›› 2018, Vol. 17 ›› Issue (06): 1246-1251.DOI: 10.1016/S2095-3119(17)61830-6

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  • 收稿日期:2017-09-04 出版日期:2018-06-01 发布日期:2018-06-05

Prevalence and characteristics of extended spectrum β-lactamaseproducing Escherichia coli from bovine mastitis cases in China

YANG Feng, ZHANG Shi-dong, SHANG Xiao-fei, WANG Xu-rong, WANG Ling, YAN Zuo-ting, LI Hong-sheng   

  1. Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730050, P.R.China
  • Received:2017-09-04 Online:2018-06-01 Published:2018-06-05
  • Contact: Correspondence YANG Feng, Tel: +86-931-2115262, Fax: +86-931-2114180, E-mail: yangfeng@caas.cn; LI Hong-sheng, Tel: +86-931-2164183, Fax: +86-931-2114180, E-mail: lihsheng@sina.com
  • Supported by:
    This work was funded by the National Key R&D Program of China (2017YFD0502200) and the Central Public-Interest Scientific Institution Basal Research Fund, China (1610322017013).

Abstract:

The aim of the study was to investigate the prevalence and characterization of extended-spectrum β-lactamase (ESBL)-producing Escherichia coli isolated from bovine mastitis cases in China.  ChromID ESBL agar was used to confirm ESBL-producing E. coli.  PCR and DNA sequencing were employed to characterize the genotype of ESBL-producers.  Antimicrobial susceptibility was measured by disc diffusion.  Overall, 73 of 318 E. coli isolates (22.96%) were identified as ESBL-producers.  Of these ESBL-producing E. coli, the prevalence of blaCTX-M and blaTEM-1 was 97.26 and 71.23%, respectively.  The predominant CTX-M-type ESBL was CTX-M-15 (65.75%), followed by CTX-M-14 (10.96%), CTX-M-55 (9.59%), CTX-M-64 (5.48%), CTX-M-65 (4.11%) and CTX-M-3 (1.37%).  This study is the first report of CTX-M-64 and CTX-M-65 in E. coli isolated from bovine mastitis.  Furthermore, 72 ESBL-producing E. coli isolates (98.63%) were found to be multidrug-resistance.  This study noted high prevalence and rates of antimicrobial resistance of ESBL-producing E. coli isolates from bovine mastitis cases in China.

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