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 35219

Mycobacterium fallax

Contents 1 Description 2 Pathogenesis 3 Type Strain 4 References

[edit] 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.

[edit] Pathogenesis

• Not known. Biosafety level 1.

[edit] Type Strain

• Isolated from environmental sources in France and the former Czechoslovakia. Strain ATCC 35219 = CCUG 37584 = CIP 81.39 = DSM 44179 = JCM 6405.

[edit] References

• Lévy-Frébault et al. 1983. Mycobacterium fallax sp. nov. Int. J. Syst. Bacteriol., 1983, 33, 336-343.