Rapid identification of Mycobacterium tuberculosis in BACTEC MGIT960 cultures by in-house loop-medicated isothermal amplification.
Jpn J Infect Dis 2012;
65:306-11. [PMID:
22814152 DOI:
10.7883/yoken.65.306]
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Abstract
Definitive diagnosis of tuberculosis (TB) by conventional culture, followed by bacterial identification based on biochemical tests is time-consuming and tedious. Simple loop-mediated isothermal amplification (LAMP) specific for Mycobacterium tuberculosis complex, targeting the M. tuberculosis 16S ribosomal RNA gene, termed TB-LAMP, was evaluated as an alternative for rapid culture confirmation. TB-LAMP was assessed for its ability to detect M. tuberculosis complex in BACTEC MGIT 960-positive cultures. Of the 103 cultures evaluated, 100 were identified to contain M. tuberculosis complex by TB-LAMP and had concordant results with standard biochemical tests of niacin accumulation, nitrate reductase, lack of heat-stable catalase, and susceptibility to para-nitrobenzoic acid. These results indicate that TB-LAMP in combination with BACTEC MGIT 960 is a specific, reliable, and technically feasible method for rapid and accurate identification of M. tuberculosis complex.
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