Nontuberculous Mycobacterial Pulmonary Disease
نویسندگان
چکیده
Tuberculosis (TB) is an infectious and transmissible disease caused by Mycobacterium tuberculosis and closely related mycobacterial species (M. bovis, M. africanum, and M. microti). These species, obligate pathogens, compose what is known as the M. tuberculosis complex. Nontuberculous mycobacterial (NTM) species are mycobacterial species other than those belonging to the Mycobacterium tuberculosis complex. Nontuberculous mycobacteria are generally free-living organisms that are ubiquitous in the environment. There have been more than 140 NTM species identified. In 1959, Runyon proposed a classification of NTM into four major groups, based on growth rate and colony pigmentation (Runyon EH , 1959).
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