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Recently, the isolation rate of nontuberculous mycobacteria (NTM) in clinical laboratories and the incidence of NTM infections are on the increase in Korea, but there have been only a few studies that reveal the general aspect of NTM isolation or species distribution. Therefore, this study was performed to examine the species identification by PCR-restriction fragment length polymorphism analysis (PRA, PCR-RFLP), and the clinical significance of mycobacterial cultures. PRA was used during the novel region of the rpoB gene and was developed for rapid and precise identification of mycobacteria to the species level. From January 2012 to April 2012, we examined pre-identified nontuberculous mycobacteria (60 species in 3 hospital of Busan-Kyeongnam area). We confirmed 4 (6.6%) Mycobacterium tuberculosis (MTB) and 56 (93.4%) NTM from 60 pre-identified NTM species by multiplex PCR (MolecuTech MTB-IDR V3, YD Diagnostics, Korea) and PRA (Myco-ID, YD Diagnostics, Korea). The distribution of 56 NTM species were M. intracellulare type I 15 (26.7%), M. avium 14 (25%), M. abscessus 11 (19.5%), M. kansasii type I 3 (5.4%), M. pulveris 2 (3.6%), M. intracellulare type, M. chelonae, M. kansasii type V, M. gallinarum, M. wolinskyi. Respectively, 1 (1.8%) and 6 (10.7%) species were not identified.

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