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a genus of bacteria, related to actinomycetes; it differs from true bacteria in a number of ways. The young vegetative cells are rodlike (0.5–0.8 × 2.2 microns); they are capable of branching and acquiring V or Y shapes. In old cultures spherical cells predominate. Mycobacteria, which do not form endospores, are nonmotile, gram-positive, and strictly aerobic. They reproduce mainly by dividing and budding. Mycobacteria contain carotenoids, and, as a result, their colonies are often pigmented (yellow, orange, or red). Owing to their cell composition (including lipides and wax), some myco-bacteria, in contrast to other bacteria, are acid-fast.

Mycobacteria are widely distributed in soils and are active in the mineralization of plant remains. Some species of Mycobacterium are nitrogen-fixing microorganisms; others are capable of metabolizing the carbohydrates of petroleum and natural gas and, when cultured, accumulate protein, which is used for fodder and other purposes. Some species of Mycobacterium are pathogenic to humans (for example, mycobacteria are the causative agents of tuberculosis and leprosy).


References in periodicals archive ?
patients RR (95% CI) p value Mycobacterium kansasii 194 0.92 (0.89-0.94) <0.0001 M.
Wallace, "Thrice-weekly clarithromycin-containing regimen for treatment of Mycobacterium kansasii lung disease: results of a preliminary study," Clinical Infectious Diseases, vol.
Wang, "Disseminated cutaneous Mycobacterium kansasii infection presenting with Rosai-Dorfman disease-like histological features in a patient carrying anti-interferon-[gamma] autoantibodies," The Journal of Dermatology, vol.
As interferon-a releasing assays (IGRAs) examine the MTB specific antigen early secretory antigenic target-6 (ESAT-6) and culture filtrate protein-10 (CFP-10), all NTM infected samples would have negative results, but one patient had false positive result due to Mycobacterium kansasii .
Mycobacterium kansasii is an atypical, slow-growing mycobacterium that causes pulmonary infections in the immunocompromised host.
Shitrit, "Clinical and radiological features of Mycobacterium kansasii and other NTM infections," Respiratory Medicine, vol.
Clinical features and follow up of 302 patients with Mycobacterium kansasii pulmonary infection: A 50 year experience.
et al.Treatment of pulmonary disease due to Mycobacterium kansasii: recent experience with rifampin.
Nontuberculous mycobacteria including Mycobacterium kansasii and Mycobacterium avium-intracellulare complex can cause pulmonary infections that are associated with cavities.
(1) Mycobacteria are often implicated as infectious causes of granulomatous hepatitis; reports have cited Mycobacterium tuberculosis, Mycobacterium avium-intracellulare complex, Mycobacterium leprae, bacillus Calmette-Guerin, Mycobacterium kansasii, and Mycobacterium fortuitum.
Use of Gen-Probe AccuProbes to identify Mycobacterium avium complex, Mycobacterium tuberculosis complex, Mycobacterium kansasii, and Mycobacterium gordonae directly from BACTEC TB broth cultures.

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