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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 ?
Klatser, "The use of whole blood in a dipstick assay for detection of antibodies to Mycobacterium leprae: a field evaluation," FEMS Immunology and Medical Microbiology, vol.
Is drug-resistant Mycobacterium leprae a real cause for concern?
A rapid method for the detection of potentially viable Mycobacterium leprae in human biopsies: a novel application of PCR.
C57BL/6 WT and BKO mice were injected intramuscularly on three occasions, at 15-day intervals, with 100 mg pcDNA3 encoding Mycobacterium leprae 65-kDa heat-shock protein (DNA-Hsp65 group) or with 100 mg empty pcDNA3 as a control (Vector group).
(4.) Cardona-Castro N, Beltran J, Ortiz-Bernal A, Vissa V Detection of Mycobacterium leprae DNA in nine-banded armadillos (Dasypus novemcinctus) from the Andean region of Colombia.
Leprosy, a chronic infection caused by Mycobacterium leprae, is one of the oldest recorded diseases of humankind.
La lepra es una enfermedad infecciosa granulomatosa cronica producida por Mycobacterium leprae que afecta la piel y el sistema nervioso periferico.
A pesar de que hasta los momentos no se ha podido cultivar in vitro el Mycobacterium leprae (5) se ha hecho un gran avance en las diferentes disciplinas que estudian la enfermedad.
Hansen's disease or leprosy is a contagious infection pathology produced by an alcohol-acid resistant bacillus, known as Hansen's bacillus or Mycobacterium leprae. M.
Armadillos are known to harbor several pathogens, such as Trypanossoma cruzi, Toxoplasma gondii, species of Sarcocystis and Eimeria, Piroplasma (Diniz et al., 1997), Leptospira sp., Sporothrix schenckii, Paracoccidioides brasiliensis (Naiff et al., 1986; Silva-Vergara, 1997; Bagagli et al., 1998; Macedo, 1999; Vergara and Martinez, 1999) and Mycobacterium leprae (Truman, in press), though the zoonotic transmission potential of these microorganisms has not yet been clarified.
He found that the bacterium had the most in common with Mycobacterium leprae, previously thought to be the sole cause of leprosy Yet, there also were significant differences with M.

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