哺乳母猪,肠杆菌,喹诺酮类药物,耐药," /> 哺乳母猪,肠杆菌,喹诺酮类药物,耐药,"/> nursing sow,enterobacteria,quinolone,resistance
,"/> <font face="Verdana">哺乳母猪肠杆菌PMQR基因的检测#br# </font>

中国农业科学 ›› 2010, Vol. 43 ›› Issue (8): 1716-1722 .doi: 10.3864/j.issn.0578-1752.2010.08.021

• 兽医 • 上一篇    下一篇

哺乳母猪肠杆菌PMQR基因的检测#br#

李树娟,岳磊,廖晓萍,蒋智钢,陈雪影,阳艳林,张悦,黄楚艳,刘雅红#br#   

  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)
  • 收稿日期:2009-11-26 修回日期:2010-01-22 出版日期:2010-04-15 发布日期:2010-04-15
  • 通讯作者: 刘雅红

Detection of Plasmid-Mediated Quinolone Resistance of Enterobacteria in Nursing Sow#br#

LI Shu-juan, YUE Lei, LIAO Xiao-ping, JIANG Zhi-gang, CHEN Xue-ying, YANG Yan-lin, ZHANG Yue, HUANG Chu-yan, LIU Ya-hong#br#   

  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)
  • Received:2009-11-26 Revised:2010-01-22 Online:2010-04-15 Published:2010-04-15
  • Contact: LIU Ya-hong

摘要:

【目的】探讨广东集约化猪场哺乳母猪肠杆菌质粒介导喹诺酮类耐药(PMQR)基因的存在情况及其与Ⅰ类整合子的流行相关性。 【方法】通过PCR测序对分离自哺乳母猪的74株大肠杆菌和20株沙门氏菌进行PMQR(qnrA ,qnrB, qnrS,aac(6')-Ib-cr,qepA)基因检测。对PMQR基因阳性株进行Ⅰ类整合酶intⅠ基因PCR检测。采用琼脂平皿二倍稀释法测定PMQR阳性株对14种抗菌药物的MIC值。【结果】在94株被测菌中,共检出PMQR阳性菌14(14.9%)株,其中qnrB 阳性菌2株,qnrS 阳性菌11株,aac(6')-Ib-cr 阳性菌4株,有1株沙门氏菌Salmonella 14同时携带qnrB,qnrS,aac(6')-Ib-cr 3种PMQR基因,1株大肠杆菌E. coli 2同时携带qnrB和aac(6')-Ib-cr。qnrA和qepA未有检测出。14株PMQR阳性菌均携带Ⅰ类整合子且耐药性普遍较为严重。【结论】哺乳母猪源的肠杆菌存在PMQR基因的流行,且以qnrS的检出率为最高。Ⅰ类整合子与PMQR基因同时存在,是导致哺乳母猪肠杆菌多重耐药的重要因素。

关键词: 哺乳母猪')">哺乳母猪, 肠杆菌, 喹诺酮类药物, 耐药

Abstract:

【Objective】 To investigate the prevalence of the plasmid-mediated quinolone resistance PMQR genes and their molecule epidemiological relationship with class 1 integrons of nursing sow origin Enterobacteria in Guangdong Province. 【Method】 Seventy-four Escherichia coli, 20 Salmonella were screened for the PMQR(qnrA, qnrB, qnrS, aac(6')-Ib-cr, qepA) genes by PCR and then conformed with sequencing. intIⅠ was screened from the PMQR positive strains. Antimicrobial susceptibility tests for the PMQR positive strains were performed by the agar dilution method. 【Result】 PMQR genes were detected in 14 (14.9%) of 94 strains, including 2 strains carried qnrB,11 strains carried qnrS, and 4 strains carried aac(6')-Ib-cr gene. The strain Salmonella 14 harboured 3 PMQR genes (qnrB, qnrS and aac(6')-Ib-cr), and one E. coli 2 harboured qnrB and qnrS. qnrA and qepA were not detected. intI1 was detected in all the 14 PMQR positive strains and they showed high rate of resistance to antimicrobial agents widely used in veterinary medicine. 【Conclusion】 The prevalence of PMQR genes existed from strains of Enterobacteria in nursing sow in Guangdong Province. And had a highest prevalence of qnrS was detected among Enterobacteria strains from the farms. The co-exist of class Ⅰintegron and PMQR genes played an important role in multi antimicrobial resistance in Enterobacteria.

Key words: nursing sow')">nursing sow, enterobacteria, quinolone, resistance