食品科学 ›› 2011, Vol. 32 ›› Issue (9): 130-134.doi: 10.7506/spkx1002-6630-201109030

• 生物工程 • 上一篇    下一篇

陕西省部分地区零售肉中沙门氏菌和奇异变形杆菌Ⅰ类整合子检测与耐药分析

申进玲,杨保伟,席美丽,孟江洪   

  1. 1.西北农林科技大学食品科学与工程学院 2.美国马里兰大学营养与食品科学系
  • 出版日期:2011-05-15 发布日期:2011-04-11
  • 基金资助:
    教育部长江学者讲座教授奖励计划项目(Z111020001);西北农林科技大学留学回国人员基金项目(Z111020525)

ClassⅠIntegron and Antibiotic Resistance of Salmonella and Proteus mirabilis in Retail Meat from Shaanxi Province

SHEN Jin-ling1,YANG Bao-wei1,*,XI Mei-li1,MENG Jiang-hong1,2   

  1. 1. College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; 2. Department of Nutrition and Food Science, University of Maryland, College Park MD20742, USA
  • Online:2011-05-15 Published:2011-04-11

摘要: 采用PCR技术检测2007-2008年分离于陕西省的443份零售肉中63株沙门氏菌和29株奇异变形杆菌Ⅰ类整合子,得到其在菌株中的流行情况;使用限制性内切酶酶切和DNA序列分析技术确定Ⅰ类整合子所携带的耐药基因盒;采用国家临床实验室标准化委员会(CLSI)推荐的琼脂稀释法测定Ⅰ类整合子阳性菌株对14种抗生素的药敏性。结果表明:10株(16%)沙门氏菌含有Ⅰ类整合子,其大小主要为1281bp和1842bp两种类型,携带的耐药基因分别为IntI1-blaPSE-1和dhfrXII-orf-aadA2;7株(24%)变形杆菌含有Ⅰ类整合子,主要为1123、1526、1590bp 3种类型,携带的耐药基因分别有IntI1-blaPSE-1、aadB-aadA2和dfr17-aadA5。分离自陕西省零售肉中携带有多种Ⅰ类整合子的沙门氏菌和奇异变形杆菌均为多重耐药株,耐药基因分别介导对氨基糖苷类、β-内酰胺类和甲氧苄氨嘧啶类抗生素的抗性。奇异变形杆菌中Ⅰ类整合子检出率比沙门氏菌高,且种类较为丰富。

关键词: 零售肉, 沙门氏菌, 奇异变形杆菌, 整合子, 耐药

Abstract: Sixty-three Salmonella and twenty-nine Proteus mirabilis isolates were detected in retail meat from Shaanxi Province during the period of 2007-2008. Class Ⅰ integrons were identified by DNA sequence analysis and restriction enzyme digestion. The antibacterial susceptibility of class Ⅰ integron-positive strains were further tested by using fourteen antibiotics and the agar dilution method recommended by the Clinical Laboratory and Standard Institute (CLSI). The results indicated that two kinds of class Ⅰ integrons were identified in 10 Salmonella isolates (16%), with 1281 bp integron containing IntI1-blaPSE-1 and 1842 bp integron containing dhfrXII-orf-aadA2. Of twenty-nine Proteus mirabilis isolates, seven (24%) contained class Ⅰ integrons with 1123, 1526 and 1590 bp harboring IntI1-blaPSE-1, aadB-aadA2 and dfr17-aadA5 genes. All class Ⅰ integron-postitive isolates were multi-drug resistant strains. The antibiotic resistant genes in these integrons could mediate resistance to β-lactams, trimethoprim and aminoglycosides. More class Ⅰ integrons existed in Proteus mirabilis than in Salmonella.

Key words: retail meat, Salmonella, Proteus mirabilis, integron, drug resistance

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