| Mycobacterium tusciae |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Actinobacteria, Class Actinobacteria, Order Actinomycetales, Suborder Corynebacterineae, Family Mycobacteriaceae, Genus
Mycobacterium, Mycobacterium tusciae Tortoli et al. 1999.
Mycobacterium, Mycobacterium tusciae Tortoli et al. 1999.
Acid-alcohol-fast rods. Nonmotile. Non-spore forming.
Colonies are rough and strongly yellow-pigmented. Their early microscopic
morphology on Middlebrook 7H11 agar is characterized by a very elevated centre
surrounded by an uneven flat fringe. At temperatures between 25 and 32 ºC,
scotochromogenic colonies grow in about 4 weeks on Lowenstein-Jensen medium.
Growth at 37 ºC is inconsistent and requires a longer incubation, while no growth
occurs at 42 ºC. No growth in media supplemented with 5% (w/v) NaCl or on
MacConkey agar.
morphology on Middlebrook 7H11 agar is characterized by a very elevated centre
surrounded by an uneven flat fringe. At temperatures between 25 and 32 ºC,
scotochromogenic colonies grow in about 4 weeks on Lowenstein-Jensen medium.
Growth at 37 ºC is inconsistent and requires a longer incubation, while no growth
occurs at 42 ºC. No growth in media supplemented with 5% (w/v) NaCl or on
MacConkey agar.
Isolated from a lymph node of an immunocompromised child, from tap water and from a respiratory sample from apatient with
chronic fibrosis;
Resistant to ethambutol (2 µg/ml), thiophene-2-carboxylic acid and thiacetazone. Susceptible to rifampin (32 µg/ml), streptomycin (8
µg/ml), ciprofloxacin, clarithromycin, rifabutin, and sparfloxacin.
chronic fibrosis;
Resistant to ethambutol (2 µg/ml), thiophene-2-carboxylic acid and thiacetazone. Susceptible to rifampin (32 µg/ml), streptomycin (8
µg/ml), ciprofloxacin, clarithromycin, rifabutin, and sparfloxacin.
Not considered to be pathogenic.
- John G. Magee and Alan C. Ward 2012. Family III. Mycobacteriaceae Chester 1897, 63AL in Bergey’s Manual of Systematic
Bacteriology, Volume Five The Actinobacteria, Part A, Michael Goodfellow & al. (editors), 312-375. - Tortoli E, Kroppenstedt RM, Bartoloni A, Caroli G, Jan I, Pawlowski J, Emler S. Mycobacterium tusciae sp. nov. Int J Syst Bacteriol
1999; 49:1839-1844.
Positive results for acid phosphatase, heat-stable catalase (68 ºC), nitrate reductase, Tween 80 hydrolysis after 10 days incubation,
arylsulfatase after 14 days, but not after 3 days incubation, and urease.
Negative results for niacin accumulation, beta-galactosidase, and semi-quantitative catalase test.
Variable results for Tellurite reduction (9 days).
arylsulfatase after 14 days, but not after 3 days incubation, and urease.
Negative results for niacin accumulation, beta-galactosidase, and semi-quantitative catalase test.
Variable results for Tellurite reduction (9 days).
(c) Costin Stoica
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