Mycobacterium fallax
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Mycobacterium fallax is a species of the phylum Actinomycetota (Gram-positive bacteria with high guanine and cytosine content, one of the dominant phyla of all bacteria), belonging to the genus Mycobacterium.
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 at 30 °C, but not at 37 °C, on Löwenstein-Jensen or Middlebrook 7H10 media.[1]
- 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
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