›› 2011, Vol. 38 ›› Issue (12): 163-165.

• 疾病防治 • 上一篇    下一篇

食品动物源产超广谱β-内酰胺酶大肠杆菌的流行状况调查

郑红青, 邓玉婷, 何良英, 杨铜, 姚琼芬, 田伟, 刘健华   

  1. 华南农业大学兽医学院 广东省兽药研制与安全评价重点实验室,广东广州 510642
  • 收稿日期:2011-04-18 修回日期:1900-01-01 出版日期:2011-12-20 发布日期:2011-12-20
  • 通讯作者: 刘健华

Prevalence of Extended-Spectrum β-Lactamase in Escherichia coli Isolates from Food-producing Animals

ZHENG Hong-qing, DENG Yu-ting, HE Liang-ying, YANG Tong, YAO Qiong-fen, TIAN Wei, LIU Jian-hua    

  1. Guangdong Key Laboratory for Veterinary Drug Development and Safty Evaluation, College of Veterinary Medicine,South China Agricultural University,Guangzhou 510642,China
  • Received:2011-04-18 Revised:1900-01-01 Online:2011-12-20 Published:2011-12-20

摘要: 本研究旨在了解产超广谱β-内酰胺酶(ESBLs)大肠杆菌和CTX-M型耐药基因在食品动物的流行状况。对分离自养殖场的1273株大肠杆菌(健康动物源755株,患病动物源518株),采用双纸片协同试验筛选ESBLs阳性菌,并通过PCR法和基因测序鉴定阳性菌CTX-M型的基因型。1273株食品动物源大肠杆菌中筛选出产ESBLs阳性菌181株,阳性率为14.2%,其中患病动物阳性率比健康动物高,分别为19.9%和10.3%。151株(83.4%)产ESBLs大肠杆菌中检测到CTX-M型基因,占所有食品动物源大肠杆菌的11.8%,其中以CTX-M-9G为主,阳性率为79.5%(120/151),远高于CTX-M-1G的携带率25.8%(39/151),其中8株同时携带了CTX-M-1G和CTX-M-9G。产ESBLs的大肠杆菌在食品源动物中流行普遍,CTX-M是产ESBLs阳性菌中的主要流行基因型。

关键词: 食品动物; 大肠杆菌; ESBLs

Abstract: The purpose of this study was to investigate the prevalence of extended-spectrum β-lactamase(ESBLs) and CTX-M genes among Escherichia coli isolated from food-producing animals.A total of 1273 E. coli (707 from healthy animals and 566 from sick animals) isolated from food-producing animals,including pigs,chickens and ducks. ESBLs-producing isolates were screened by the double-disk synergy test. PCR was performed to amplify CTX-M genes among ESBL-producing isolates. ESBLs production was detected by the screening method for 181(14.2%) of the 1273 isolates. The percentage of ESBLs production in isolates from sick animals (19.9%) was higher than isolates from healthy animals (10.3%). In 181 ESBLs-producing strains,151 isolates (83.4%),representing 11.8% of the total E. coli isolates,harbored the CTX-M type β-lactamases. High prevalence of ESBL and CTM-M genes were found in E.coli isolates from food-producing animals. CTX-M genes were the main type of ESBLs in E.coli isolates from food-producing animals.

Key words: food-producing animal; Escherichia coli; ESBLs

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