| Mycobacterium conspicuum |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Actinobacteria, Class Actinobacteria, Order Actinomycetales, Suborder Corynebacterineae, Family Mycobacteriaceae, Genus
Mycobacterium, Mycobacterium conspicuum Springer et al. 1996.
Mycobacterium, Mycobacterium conspicuum Springer et al. 1996.
Acid-alcohol-fast coccobacilli. Does not form aerial hyphae, capsules, or spores.
Colonies are dysgonic, smooth, yellowish, and non-photochromogenic. Visible
growth occurs in 2-3 weeks from dilute inocula on Lowenstein-Jensen medium.
Temperature range for growth is 22-31 ºC; does not grow at 37 ºC under routine
conditions, but growth at 37 ºC was achieved in BACTEC 12B medium. Does not
grow on media supplemented with 5% (w/v) NaCl or on MacConkey agar (without
crystal violet).
growth occurs in 2-3 weeks from dilute inocula on Lowenstein-Jensen medium.
Temperature range for growth is 22-31 ºC; does not grow at 37 ºC under routine
conditions, but growth at 37 ºC was achieved in BACTEC 12B medium. Does not
grow on media supplemented with 5% (w/v) NaCl or on MacConkey agar (without
crystal violet).
Isolated from blood, sputum, and skin biopsy of patients with immune deficiency and disseminated mycobacterial infection.
Resistant to isoniazid (1 μg/ml), hydroxylamine (500 μg/ml), and thiophene-2-carboxylic acid hydrazide (TCH). Susceptible to
ethambutol (2 μg/ml), rifampin (32 μg/ml), and streptomycin (8 μg/ml).
Resistant to isoniazid (1 μg/ml), hydroxylamine (500 μg/ml), and thiophene-2-carboxylic acid hydrazide (TCH). Susceptible to
ethambutol (2 μg/ml), rifampin (32 μg/ml), and streptomycin (8 μg/ml).
May cause disseminated infection in immunocompromised persons.
- 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. - Springer B, Tortoli E, Richter I, Grunewald R, Rusch-Gerdes S, Uschmann K, Suter F, Collins MD, Kroppenstedt RM, Bottger EC.
Mycobacterium conspicuum sp. nov., a new species isolated from patients with disseminated infections. J Clin Microbiol 1995; 33:
2805-2811. - Rastogi N, Legrand E, Sola C. The mycobacteria: an introduction to nomenclature and pathogenesis. Rev Sci Tech. 2001;20(1):21‐
54. doi:10.20506/rst.20.1.1265
Positive results for arylsulfatase (3 and 10 days), heat-stable catalase (68 ºC), and Tween 80 hydrolysis.
Negative results for acetamidase, benzamidase, semiquantitative catalase test, beta-galactosidase, niacin accumulation, nitrate
reductase, nicotinamidase, pyrazinamidase, tellurite reduction, and urease.
Variable results for acid phosphatase.
Negative results for acetamidase, benzamidase, semiquantitative catalase test, beta-galactosidase, niacin accumulation, nitrate
reductase, nicotinamidase, pyrazinamidase, tellurite reduction, and urease.
Variable results for acid phosphatase.
(c) Costin Stoica
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