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中国防痨杂志 ›› 2011, Vol. 33 ›› Issue (3): 158-162.

• 论著 • 上一篇    下一篇

噬菌体生物扩增法检测结核分枝杆菌阿米卡星耐药性方法的建立及应用评价

李同心2  崔振玲1  汪小黎1  陆俊梅1  王洁1  胡忠义1   

  1. 1.同济大学附属上海市肺科医院/上海市结核重点实验室, 上海, 200433; 2.重庆市公共卫生医疗救治中心, 重庆, 400036
  • 收稿日期:2011-11-16 出版日期:2011-03-20 发布日期:2012-03-16
  • 通信作者: 崔振玲 E-mail:cuizhenling@163.com
  • 基金资助:

    国家十一五科技重大专项课题(2008ZX10003-003-02); 上海市科委课题(09415801800)

Evaluation of phage amplified biologically assay for amikacin susceptibility test of Mycobacterium tuberculosis

Li Tongxin2, Cui Zhenling1, Wang Xiaoli1, Lu Junmei1, Wang Jie1, Hu Zhongyi1   

  1. 1.Shanghai Tuberculosis Key Laboratory; The Pulmonary Hospital of Shanghai Affiliated Tongji University, Shanghai 200433, China; 2.Chongqing Infectious Diseases Medical Center,Chongqing,400036
  • Received:2011-11-16 Online:2011-03-20 Published:2012-03-16
  • Contact: Cui Zhenling E-mail:cuizhenling@163.com

摘要: 目的 建立结核分枝杆菌阿米卡星(Am)耐药性的噬菌体生物扩增法(PhaB)快速检测技术,并探讨其临床应用价值。 方法 通过不同菌量及药物浓度的筛选,建立PhaB测定结核分枝杆菌阿米卡星药敏检测方法;用该方法对108株结核分枝杆菌临床分离株进行了阿米卡星药敏检测,同步进行Bactec MGIT 960的Am药敏检测,对2种方法的检测结果进行比较分析。结果不符合的菌株测定其Am的最低抑茵浓度(MIC)。 结果 以细菌接种量10-3 mg/ml、药物浓度2 μg/ml、37℃作用48-h为药敏最佳检测条件,噬菌体检测108株结核分枝杆菌临床分离株阿米卡星敏感82株、耐药26株,Bactec MGIT 960检测敏感80株、耐药28株;2法测定均为敏感79株、均为耐药25株。以Bactec MGIT 960测定结果为判断标准,则PhaB的敏感性、特异性、阳性和阴性预测值及符合率分别为89.3%、98.8%、96.2%、96.3%、96.3%。 结论 PhaB检测结核分枝杆菌的Am耐药性有较高的敏感性、特异性和准确性,整个检测只需3 d,且操作简单、不需特殊仪器设备,可作为 M .TB临床分离株Am药敏快速检测备选方法之一。

关键词: 分枝杆菌, 结核, 阿米卡星, 药物敏感性实验, 细菌噬菌体

Abstract: Objective To set up a rapid detective technique for amikacin (Am) resistance inMycobacterium tuberculosis( M .TB) by phage amplified biologically (PhaB) assay, and to evaluate its value for application in clinical isolates.  Methods The different concentrations of M .TB and Am were screened to obtain the best conditions in PhaB assay. Am susceptibility of 108 M .TB clinical isolates were detected by PhaB assay and compared with the Results from Bactec MGIT 960. If the Results of two Methods were different, the MICs of strains were detected.  Results The best test conditions of PhaB assay were that 10-3 mg/ml of M .TB and 2 μg/ml of amikacin were mixed and incubated at 37 ℃ for 48 hours.Of 108 M .TB clinical isolates, 82 were sensitive and 26 were resistant to Am by PhaB assay; while 80 were sensitive and 28 were resistant to Am by Bactec MGIT 960. When Bactec MGIT 960 was used as the control,the sensitivity,specificity, PPV, NPV and accuracy of PhaB assay were 89.3%, 98.8%, 96.2%, 96.3%, 96.3%, respectively.  Conclusions The PhaB assay only need 3 days. It is a highly sensitive, specific, accurate, simple and low-cost method for the rapid Am susceptibility test of M .TB isolates.

Key words: Mycobacterium tuberculosis, amikacin, microbial sensiti dity test, bacteriophages