Mycobacterium fallax

Mycobacterium fallax is a species of the phylum Actinobacteria (Gram-positive bacteria with high guanine and cytosine content, one of the dominant phyla of all bacteria), belonging to the genus Mycobacterium.

Mycobacterium fallax
Scientific classification
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M. fallax
Binomial name
Mycobacterium fallax
Lévy-Frébault, V. et al. 1983,[1] ATCC 35219

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

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

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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