Mycobacterium

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Related to Nontuberculous mycobacteria: Mycobacterium marinum

Mycobacterium

 

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).

A. A. IMSHENETSKII

References in periodicals archive ?
Invasive disease caused by nontuberculous mycobacteria, Tanzania.
abscessus complex comprises a group of rapidly growing, multidrug-resistant, nontuberculous mycobacteria that are responsible for a wide spectrum of SSTIs and other infections.
After the third debridement, bacteriologic analysis revealed the presence of nontuberculous mycobacteria (NTM), and a culture smear was positive for acid-fast bacilli.
The techniques for nontuberculous mycobacteria (NTM) are quite involved, with multiple cultures needing to be started at a variety of temperatures, because some RGM will grow only at 28[degrees]-30[degrees]C while others require 35[degrees]-37[degrees]C.
When mycobacteria are identified, the next step, for the purpose of choosing appropriate antibiotic therapy, is to differentiate between tuberculous and nontuberculous mycobacteria.
Nontuberculous mycobacteria disease accounts for a considerable proportion of the mycobacterial disease seen in silicotic patients, especially in the industrialized world, and has also been linked to worsening the clinical course of silicosis (ATS 1997a; Corbett et al.
Disseminated disease due to nontuberculous mycobacteria (NTM) is among the most severe infections in persons with advanced HIV infection.
Second, these drugs are not approved for use in Crohn's disease, although they are approved for the treatment of infections caused by nontuberculous mycobacteria.
The genus Mycobacterium consists of the members of the Mycobacterium tuberculosis complex and >80 species of nontuberculous mycobacteria, including pathogenic, opportunistic, and nonpathogenic species.
Conventional biochemical methods are available for identifying other nontuberculous mycobacteria.
The Company's wholly-owned medical devices subsidiary, Designer Diagnostics, engages in the research and development of diagnostic test kits designed to be used for the rapid identification of infectious diseases, such as Nontuberculous Mycobacteria (NTM).