《中国畜牧兽医》 ›› 2017, Vol. 44 ›› Issue (4): 1226-1232.doi: 10.16431/j.cnki.1671-7236.2017.04.040

• 基础兽医 • 上一篇    下一篇

仔猪腹泻大肠杆菌流行株鉴定及毒力与耐药性分析

刘哲1,2, 孙洋2, 纪雪2, 郭学军2, 刘军2, 祝令伟2, 周伟2, 冯书章1,2   

  1. 1. 吉林大学动物医学学院, 长春 130062;
    2. 军事医学科学院军事兽医研究所, 吉林省人兽共患病预防与控制重点实验室, 长春 130122
  • 收稿日期:2016-07-29 出版日期:2017-04-20 发布日期:2017-05-03
  • 通讯作者: 孙洋, 冯书章 E-mail:sunyang10@hotmail.com;shuzhangfeng@qq.com
  • 作者简介:刘哲(1990-),女,河南漯河人,硕士,研究方向:兽医微生物与免疫学,E-mail:794560520@qq.com
  • 基金资助:

    吉林省自然科学基金项目(20150101110JC);国家科技重大专项(2013ZX10004-217)

Identification,Virulence and Drug Resistance Analysis of Escherichia coli from Diarrhea Piglets

LIU Zhe1,2, SUN Yang2, JI Xue2, GUO Xue-jun2, LIU Jun2, ZHU Ling-wei2, ZHOU Wei2, FENG Shu-zhang1,2   

  1. 1. College of Veterinary Medicine, Jilin University, Changchun 130062, China;
    2. Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Institute of Military Veterinary, AMMS, Changchun 130122, China
  • Received:2016-07-29 Online:2017-04-20 Published:2017-05-03

摘要:

为明确河南地区一规模化猪场暴发新生仔猪腹泻疫情的病原特性及其耐药谱,本研究对肠道致病大肠杆菌进行了分离鉴定。对腹泻仔猪粪便中分离的大肠杆菌进行13种毒力基因检测和21种抗生素的药敏试验。结果显示,34.8%分离株检出EAST1基因;所获分离株均为多重耐药菌株,且至少对5类抗生素耐药,耐9类以上抗生素的菌株达到75.3%,对氨苄西林、哌拉西林、环丙沙星、左氧氟沙星和莫西沙星耐药率达到100.0%。细菌种系进化分群结果显示,21.7%分离株属于有致病性的B2群和D群。本研究获得了腹泻仔猪大肠杆菌分离株的毒力基因、耐药谱的基本数据和种系进化分群的遗传背景,为制定有针对性的治疗和防控技术方案提供依据。

关键词: 新生仔猪; 腹泻; 大肠杆菌; 毒力基因; 耐药性

Abstract:

In order to clarify the pathogenic characteristics and drug-resistant spectrum of a newborn piglet diarrhea outbroke recently in a large-scale pig farm of Henan province, the study was carried out by the isolation of intestinal pathogenic Escherichia coli and system identification. Escherichia coli strains were isolated from the faeces of diarrhea piglets. 13 virulent genes were tested by PCR. The antibiotic susceptibility of the strains was determined. The results showed that the positive rate came up with 34.8% for EAST1 gene. All of the strains were multiple-drug resistance and resistant to at least 5 types of antibiotics. 75.3% strains were resistant to more than 9 types of antibiotics. All of the strains were resistant to ampicillin, piperacillin, ciprofloxacin, levofloxacin and moxifloxacin. The result of the phylogenetic background showed that 21.7% E.coli isolates belonged to group B2 and D which were pathogenic. According to the synthesis analysis of virulence factors, resistance and phylogenetic background of the strains isolated from the diarrhea piglets, proper clinical treatment and prevention and control measure could be provided.

Key words: newborn piglet; diarrhea; Escherichia coli; virulence gene; drug resistance

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