Mycobacterium fallax
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Mycobacterium fallax
Description
Description
Gram-positive, nonmotile and acid-fast rods (0.5 – 1µm long) except for a small number (less than 20%) of cyanophil forms.
Colony characteristics
- Large, eugonic, buff coloured and rough colonies (Löwenstein-Jensen medium at 30°C).
- Cauliflower-like morphology, resembling M. tuberculosis colonies. Cord formation at the edges of colonies (Middlebrook 7H10 agar at 30°C).
Physiology
- Rapid growth on Löwenstein-Jensen or Middlebrook 7H10 media.
- Susceptible to ethambutol, rifampin and kanamycin.
- Resistant to isoniazid, pyrazinamide and streptomycin.
Differential characteristics
- Similarities to M. tuberculosis include colony morphology, thermolabile catalase, positive nitrate reductase; differences are negative reactions for niacin production and rapid growth at 30°C.
Type Strain
Type Strain
- Isolated from environmental sources in France and the former Czechoslovakia. Strain ATCC 35219 = CCUG 37584 = CIP 81.39 = DSM 44179 = JCM 6405.
References
References
- Lévy-Frébault et al. 1983. Mycobacterium fallax sp. nov. Int. J. Syst. Bacteriol., 1983, 33, 336-343.
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