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Applicability of in-house loop-mediated isothermal amplification for rapid identification of Mycobacterium tuberculosis complex grown on solid media.

A simple, rapid, and low-cost identification method is required in tuberculosis high-burden countries. We report the applicability of in-house loop-mediated isothermal amplification (LAMP) targeting 16S ribosomal RNA for the rapid identification of Mycobacterium tuberculosis complex grown on Lowenstein-Jensen media. Eighty acid-fast staining-positive clinical isolates were selected and used to evaluate the LAMP assay in comparison with polymerase chain reaction and conventional culture-based tests. The LAMP assay identified 60 M. tuberculosis isolates from 80 clinical isolates using simple heat-extracted DNA directly from the colony suspension. The results were in complete agreement with those obtained using the other methods, and the utility of the direct LAMP assay from a colony was demonstrated. The LAMP assay appears to be a practical and low-cost method that can be used for the rapid identification of M. tuberculosis isolates and suitable for endemic low-resource settings.