生物技术通报 ›› 2014, Vol. 0 ›› Issue (8): 202-207.

• 研究报告 • 上一篇    下一篇

食源性沙门氏菌耐药性及质粒介导喹诺酮耐药基因检测

刘贵深1, 于涛2   

  1. 1.潮州市质量计量监督检测所, 潮州 521011;
    2.新乡学院, 新乡 453000
  • 修回日期:2014-01-17 出版日期:2014-08-15 发布日期:2014-08-01
  • 作者简介:作者简介: 刘贵深,男,高级工程师,研究方向:产品检验及质量管理;E-mail:suyongyu@126.com

Study on Antimicrobial Resistance and Plasmid-mediated Quinolone Resistance of Foodborne Salmonella Isolates

Liu Guishen1, Yu Tao2   

  1. 1. Chaozhou Institute of Measurement and Testing Technology, Chaozhou 521011;
    2. Xinxiang University, Xinxiang 453000
  • Revised:2014-01-17 Published:2014-08-15 Online:2014-08-01
  • Supported by:

    河南省教育厅科学技术研究重点项目(13A610839)

摘要:

随机采集的638份食品样品中沙门氏菌总检出率为9.7%(n=62株),共检出16种不同的血清型,其中最常见的为鸭沙门氏菌。受试菌株对磺胺甲基异噁唑、复方新诺明、链霉素和环丙沙星的耐药率较高。16株耐环丙沙星沙门氏菌按GyrA和ParC喹诺酮耐药决定区(QRDR)不同氨基酸替代组合可分为5种突变型,其中GyrA亚基发生Ser83Phe和Asp87Gly变异,同时ParC亚基发生Ser80Arg变异为最常见的突变类型。62株食源性沙门氏菌中,qnr基因阳性的菌株共7株,占受试菌株的11.3%。qnrAqnrS基因阳性菌株分别有2株和5株,没有菌株携带qnrBqnrCqnrD基因。aac6')-Ib基因阳性菌株共有8株,其中3株经确认为携带其变体基因aac6')-Ib-cr。结果表明,新乡市食源性沙门氏菌血清型分布呈多样性,耐药状况较为严重,并且一些菌株携带质粒介导喹诺酮耐药(PMQR)基因。

关键词: 食源性, 沙门氏菌, 耐药性, 质粒介导, 喹诺酮类

Abstract:

A total of 638 food samples were collected randomly to determine the prevalence of Salmonella. The overall percentage of Salmonella prevalence was 9.7%(n=62). Among 16 different serotypes identified, S. Anatum was most common. The isolates were frequently resistant to sulfamethoxazole, trimethoprim/sulfamethoxazole, streptomycin, and ciprofloxacin. Five different types of amino acid substitutions were identified in quinolone resistance-determining region(QRDR)of GyrA and ParC of 16 ciprofloxacin-resistant isolates. Double mutations of Ser83Phe and Asp87Gly in GyrA accompanied by an additional mutation of Ser80Arg in ParC were found most frequently. The qnr genes were present in seven(11.3%)of 62 isolates, and among them, two isolates carried qnrA and five carried qnrS. qnrB, qnrC, and qnrD were not detected in the isolates in this study. Eight isolates were positive for aac6')-Ib, of which three isolates carried the-cr variant. The results suggested the diversity of serotype distribution, serious situation of antimicrobial resistance and the presence of plasmid-mediated quinolone resistance(PMQR)genes in foodborne Salmonella from Xinxiang.

Key words: Foodborne, Salmonella, Antimicrobial resistance, Plasmid-mediated, Quinolone