利用重组分支杆菌噬菌体快速筛选耐利福平结核分支杆菌

目的：采用基因工程技术构建的可表达荧光素酶的结核分支杆菌噬菌体进行结核分支杆菌利福平药敏试验研究，建立一种特异、灵敏、快速的利福平药敏试验方法。方法采用生物发光方法分别检测重组分支杆菌噬菌体对不同细菌在不同浓度利福平培养其中的发光水平，并与罗氏培养基进行药敏药比较。结果在不同细菌中，噬菌体均特异地对分支杆菌有发光反应，分支杆菌的养基进行药敏试验比较。结果在不同细菌中，噬菌体均特异对对分支杆菌有发光

Rapid rifampicin susceptibility test by using recombinant mycobacteriophages

OBJECTIVE: To set up a fast, sensitive and specific way to detect mycobacteria and rifampicin susceptibility to mycobacteria by using recombinant mycobacteriophages and bioluminescent method. METHODS: Firstly detected the luciferase activity in different bacteria by using mycobacteriophages, then assessed the best drug concentration of rifampicin for drug susceptibility test in luciferase reporter assay, and lastly used the above conditions to decide rifampicin susceptibilities to different mycobacteria and compare the result with L-J medium culture. RESULTS: Bacteriophages had high light production specifically in mycobacteria and only very low light production in E. coli, the difference being obvious. The light production of rifampicin-resisitant mycobacterium strains was much higher than that of sensitive strains in culture with rifampicin(P < 0.05). Different drug concentrations of rifampicin were used to optimize drug concentration for rifampicin drug susceptibility test and the optimum concentration was found to be 2 micrograms/ml. The correlation of drug susceptibility test between luciferase reporter phages to L-J medium in standard strains and clinical isolates was the sarce. Temperature sensitive Phage 88 was more sensitive than Phage 40(P < 0.05). The time for drug resistance test was 72 hours. CONCLUSIONS: Luciferase reporter phage can detect mycobacteria specifically and can be used in rifampicin susceptibility test. This assay is a fast, sensitive and specific method to detect mycobacterium strains and their resistance to rifampicin.