- Mycobacterium fallax
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Mycobacterium fallax Scientific classification Kingdom: Bacteria Phylum: Actinobacteria Order: Actinomycetales Suborder: Corynebacterineae Family: Mycobacteriaceae Genus: Mycobacterium Species: M. fallax Binomial name Mycobacterium fallax
Lévy-Frébault et al. 1983, ATCC 35219Mycobacterium fallax
Contents
Description
Gram-positive, nonmotile and acid-fast rods (0.5 – 1 µm 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.
Pathogenesis
- Not known. Biosafety level 1.
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
- Lévy-Frébault et al. 1983. Mycobacterium fallax sp. nov. Int. J. Syst. Bacteriol., 1983, 33, 336-343.
Slowly growing
(R1P=photochromogenic;
R2S=scotochromogenic;
R3N=nonchromogenic)Rapidly growing/
Runyon IVM. neoaurum groupF/T groupsM. fortuitum groupM. vaccae groupM. smegmatis groupM. chelonae groupM. elephantis group
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