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ORIGINAL ARTICLE
Year : 2014  |  Volume : 6  |  Issue : 4  |  Page : 151-156

Resazurin tube method: Rapid, simple, and inexpensive method for detection of drug resistance in the clinical isolates of Mycobacterium Tuberculosis


1 Department of Microbiology, Bharati Vidyapeeth Deemed University, Medical College and Hospital, Sangli, Maharashtra, India
2 Krishna Institute of Medical Sciences, Karad, Maharashtra, India

Correspondence Address:
Santosh S Patil
Department of Microbiology, Bharati Vidyapeeth Deemed University, Medical College and Hospital, Sangli, Maharashtra
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0974-777X.145239

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Background: Tuberculosis (TB) remains a serious public health problem worldwide. The emergence of drug resistance and multidrug resistance (MDR) has become the main threat to TB treatment and control programs. Rapid detection is critical for the effective treatment of patients. In recent times, a new method using the colorimetric indicator resazurin has been proposed for drug susceptibility of Mycobacterium tuberculosis. Materials and Methods: In this study, the resazurin reduction assay was adapted to screw cap tubes. Using the Resazurin Tube Method (RTM), a total of 100 clinical isolates were tested against Rifampicin (RIF) and Isoniazide (INH). By visual reading, the minimum inhibitory concentrations (MICs) were obtained after eight days. The results obtained were compared with the gold standard proportion method. Results: Excellent results were obtained for RTM with a sensitivity of 100% for both RIF and INH, with a specificity of 98.7 and 95.3%, respectively. Kappa is the measure of agreement between the RTM and proportion method (PM) for RIF and INH, which was found to be 0.972 and 0.935 for RIF and INH, respectively. Conclusion: The RTM appears to be a reliable method for the rapid and simultaneous detection of MDR-TB and drug susceptibility testing (DST) of M. tuberculosis. It is simple, inexpensive, and with no biohazard risk involved.


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2008 Journal of Global Infectious Diseases | Published by Wolters Kluwer - Medknow
Online since 10th December, 2008