畜牧与饲料科学 ›› 2023, Vol. 44 ›› Issue (6): 116-122.doi: 10.12160/j.issn.1672-5190.2023.06.015

• 动物疾病防控 • 上一篇    下一篇

新疆维吾尔自治区和田地区规模化羊场腹泻羔羊源大肠杆菌的分离鉴定及毒力基因和耐药基因分析

董贵1,2, 于月通1, 马志远1, 王尧1, 盛光玉1, 陶大勇1, 齐萌1   

  1. 1.塔里木大学动物科学与技术学院/新疆生产建设兵团塔里木动物疫病诊断与防控工程实验室,新疆 阿拉尔 843300;
    2.塔城职业技术学院,新疆 塔城 834700
  • 收稿日期:2023-10-25 出版日期:2023-11-30 发布日期:2024-01-11
  • 通讯作者: 齐萌(1985—),男,教授,博士,硕士生导师,主要从事人兽共患病病原生物学研究工作。
  • 作者简介:董贵(1995—),男,硕士,主要研究方向为动物群发病防控。
  • 基金资助:
    新疆生产建设兵团重点领域科技攻关计划项目(2020AB025)

Prevalence of Virulence and Antimicrobial Resistance Genes in Escherichia coli Strains Isolated from Diarrheal Lambs in Large-scale Sheep Farms in Hotan Prefecture of Xinjiang Uygur Autonomous Region,China

DONG Gui1,2, YU Yuetong1, MA Zhiyuan1, WANG Yao1, SHENG Guangyu1, TAO Dayong1, QI Meng1   

  1. 1. College of Animal Science and Technology,Tarim University/Engineering Laboratory of Tarim Animal Disease Diagnosis and Control,Xinjiang Production and Construction Corps,Alar 843300,China;
    2. Tacheng Vocational and Technical College,Tacheng 834700,China
  • Received:2023-10-25 Online:2023-11-30 Published:2024-01-11

摘要: [目的]了解新疆维吾尔自治区和田地区规模化羊场腹泻羔羊源大肠杆菌的毒力基因和耐药基因携带情况。[方法]从和田地区3个规模化羊场收集70份腹泻羔羊肛拭子,采用传统的细菌分离培养、染色镜检、生化鉴定以及细菌16S rDNA序列PCR扩增、测序等方法对样本进行大肠杆菌的分离鉴定,利用PCR法对分离菌株进行大肠杆菌系统发育群分型以及毒力基因、耐药基因检测。[结果]经形态学观察、生化鉴定、16S rDNA序列分析,从70份腹泻羔羊肛拭子中分离鉴定出38株大肠杆菌,分离率为54.3%(38/70)。系统发育群分型鉴定分析显示,分离菌株以B1群为优势群(68.4%,26/38),其次是A群(26.3%,10/38)和D群(5.3%,2/38),未检测出B2群。毒力基因检测结果显示,在8种大肠杆菌毒力基因中检测出4种,携带fimC基因的菌株比例最高,为92.1%(35/38);其次是irp2基因47.4%(18/38)、hlyF基因36.8%(14/38)和fyuA基因34.2%(13/38),未检测出eaeASTLTStx1基因。耐药基因检测结果显示,在8种大肠杆菌耐药基因中检测到6种,以磺胺类耐药基因sul2基因携带率最高,为42.1%(16/38),未检出氨基糖苷类耐药基因。[结论]和田地区腹泻羔羊源大肠杆菌携带毒力基因和耐药基因,应加强对该地区羊源致病性大肠杆菌流行情况的监测。

关键词: 大肠杆菌, 鉴定, 毒力, 耐药性, 腹泻羔羊

Abstract: [Objective] This study was conducted to understand the prevalence of virulence and antimicrobial resistance genes in Escherichia coli E. coli) strains derived from diarrheal lambs in large-scale sheep farms in Hotan Prefecture, Xinjiang Uygur Autonomous Region, China. [Method] A total of 70 anal swabs of diarrheal lambs were sampled from 3 large-scale sheep farms in Hotan Prefecture. Traditional methods such as bacterial isolation and culture, staining and microscopy, biochemical identification, and 16S rDNA PCR amplification and sequencing were used to isolate and identify E. coli strains in the samples. PCR assay was employed for phylogenetic grouping of E. coli strains, as well as detection of virulence and antimicrobial resistance genes. [Result] Through morphological observation, biochemical identification, and 16S rDNA sequence analysis, a total of 38 strains of E. coli were isolated and identified from the 70 anal swabs of diarrheal lambs, with a separation rate of 54.3% (38/70). Phylogenetic grouping analysis showed that B1 group was the dominant group (68.4%, 26/38) of the isolated strains, followed by A group (26.3%, 10/38) and D group (5.3%, 2/38), and B2 group was not detected. The results of virulence gene testing showed that 4 out of 8 E. coli virulence genes were detected, and the proportion of fimC gene carrying strains were the highest at 92.1% (35/38), followed by irp2 gene at 47.4% (18/38), hlyF gene at 36.8% (14/38), and fyuA gene at 34.2% (13/38); the genes of eaeA, ST, LT and Stx1 were not detected. The results of antimicrobial resistance gene testing showed that 6 out of 8 E. coli resistance genes were detected, with the carrying rate of sulfonamide resistance gene sul2 being the highest at 42.1% (16/38); no aminoglycoside resistance genes were detected. [Conclusion] The E. coli strains from diarrheal lambs in Hotan Prefecture harbor virulence and antimicrobial resistance genes. The prevalence of pathogenic E. coli of sheep origin in this region should be monitored.

Key words: Escherichia coli, identification, virulence, antimicrobial resistance, diarrheal lamb

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