ABSTRACT
BACKGROUND: Multidrug-resistant tuberculosis is an increasing concern for public health in many parts of the world. We have evaluated the specificity and sensitivity of the mismatch assay and 3- (4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay in detecting rifampin- resistant Mycobacterium tuberculosis. METHODS: Eleven rifampin-susceptible and 15 rifampin-resistant M. tuberculosis strains were isolated from clinical specimens obtained from patients in Yonsei University College of Medicine, Severance Hospital. RNA/RNA duplex, base pair-mismatch assay (Mismatch Detect II kit, Ambion) and MTT assay were performed. RESULTS: The specificity and sensitivity of detection of rifampin resistance were 91% and 87% in mismatch assay and 73% and 67% in MTT assay, respectively. CONCLUSION: These results suggest the usefulness of mismatch assay in detecting rifampin-resistant Mycobacterium tuberculosis.
Subject(s)
Humans , Mycobacterium tuberculosis , Mycobacterium , Public Health , Rifampin , Sensitivity and Specificity , Tuberculosis , Tuberculosis, Multidrug-ResistantABSTRACT
BACKGROUND: Multidrug-resistant tuberculosis is an increasing concern for public health in many parts of the world. We have evaluated the specificity and sensitivity of the mismatch assay and 3- (4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay in detecting rifampin- resistant Mycobacterium tuberculosis. METHODS: Eleven rifampin-susceptible and 15 rifampin-resistant M. tuberculosis strains were isolated from clinical specimens obtained from patients in Yonsei University College of Medicine, Severance Hospital. RNA/RNA duplex, base pair-mismatch assay (Mismatch Detect II kit, Ambion) and MTT assay were performed. RESULTS: The specificity and sensitivity of detection of rifampin resistance were 91% and 87% in mismatch assay and 73% and 67% in MTT assay, respectively. CONCLUSION: These results suggest the usefulness of mismatch assay in detecting rifampin-resistant Mycobacterium tuberculosis.
Subject(s)
Humans , Mycobacterium tuberculosis , Mycobacterium , Public Health , Rifampin , Sensitivity and Specificity , Tuberculosis , Tuberculosis, Multidrug-ResistantABSTRACT
PURPOSE: The control of tuberculosis is seriously threatened worldwide by the recently emerging multidrug-resistant Mycobacterium tuberculosis. As a result, early detection of drug resistant M.tuberculosis strain has become very important but conventional laboratory methods are time consuming and delayed results often affect patients adversely in controlling tuberculosis. The authors studied the usefulness of the line probe assay to determine the mutaion in rpoB gene of rifampin resistant M.tuberculosis and to find out if this method can substitute conventional methods in the detection of resistant strain. METHODS: This study employed 40 clinical samples of M.tuberculosis which had been determined by culture and drug sensitivity test. After amplification of rpoB-the gene for the B subunit of the RNA polymerase-by PCR, the amplified products were hybridized with specific oligonucleotide probes immobilized on nitrocellulose strip and direct DNA sequencing was also performed. The results were compared with those of the classical susceptibility test. RESULTS: Among the 40 samples, 10 were identified as drug resistant strain by classical drug susceptibility test. Three of the ten resistant samples were rifampin resistant strains, which were identified by either method. All mutations were clustered within the region of 69bp of rpoB and all were single nucleotide mutations. Two isolates had a TCG->TTG(serine->leucine) mutation in codon 522. One isolate had a CAC->CTC(histidine->leucine) mutation in codon 526. CONCLUSION: In contrast to culture and sensitivity tests, line probe assay is an easy and speedy method for detecting rifampin resistant M.tuberculosis in clinical samples as well as a helpful tool for choosing antituberculosis drug in children.