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Pathogenic Classification and Clinical Characteristics of Nontuberculous Mycobacterial Pulmonary Disease in a National Tuberculosis Hospital  

Choi, Sun-Pil (Department of Medicine, National Masan Tuberculosis Hospital)
Lee, Bong-Keun (Clinical Research Center for Tuberculosis, National Masan Tuberculosis Hospital)
Min, Jin-Hong (Department of Medicine, National Masan Tuberculosis Hospital)
Kim, Jin-Hee (Clinical Research Center for Tuberculosis, National Masan Tuberculosis Hospital)
Publication Information
Tuberculosis and Respiratory Diseases / v.59, no.6, 2005 , pp. 606-612 More about this Journal
Abstract
Background : It has been reported that nontuberculosis mycobacterium(NTM) isolates account for approximately 10% of patients with a positive Acid-Fast Bacilli(AFB) smear. Therefore, it is necessary to consider NTM pulmonary disease when such a positive test is encountered. The aim of this study was to evaluate the etiologies and clinical characteristics of patients with NTM pulmonary disease who had been treated at a national tuberculosis hospital. Methods : The NTM isolates were recovered from the sputum or bronchial washing specimens submitted to a clinical laboratory of National Masan TB Hospital from August 2002 to July 2003. All samples were identified using a polymerase chain reaction-restriction fragment length polymorphism analysis method, which amplifies the rpoB gene. The patients were diagnosed with NTM disease according to the American Thoracic Society diagnostic criteria. Results : One hundred NTM isolates were recovered from 57 patients. Of the 100 isolates, M. avium complex(MAC) was the most common species, which was found 55%(n=55) of patients, followed by M. abscessus(n=25), and M. fortuitum( n=9). 26(45.6%) patients had NTM disease. Twenty-six (45.6%) patients had NTM disease according to The American Thoracic Society classification. The main organisms involved in NTM disease were MAC(n=19, 73.1%) and M. abscessus(n=5, 19.2%). The pathogenic potential was 67.9% in M. intracellulare and 41.7% in M. abscessus. The predictive factors related to NTM disease were a positive sputum smear (OR 6.4, p=0.02) and the isolation of either MAC or M. abscessus(OR 6.9, p=0.007). Fifteen patients(57.7%) were cured. There were no significant factors associated with the treatment success. Conclusion : There was a relatively high proportion of NTM disease in NTM isolates and the common species were MAC and M. abscessus. The predictive factors for NTM disease were a positive sputum smear and the isolation of either MAC or M. abscessus.
Keywords
Nontuberculous mycobacterium; Mycobacterium avium complex; Mycobaterium abscessus; Lung disease;
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