Mycobacterium fallax
Scientific classification
Domain:	Bacteria
Kingdom:	Bacillati
Phylum:	Actinomycetota
Class:	Actinomycetia
Order:	Mycobacteriales
Family:	Mycobacteriaceae
Genus:	Mycobacterium
Species:	M. fallax
Binomial name
Mycobacterium fallax Lévy-Frébault, V.et al. 1983,[1] ATCC 35219

Mycobacterium fallax is a species of the phylumActinomycetota (Gram-positivebacteria with highguanine and cytosine content, one of the dominant phyla of all bacteria), belonging to the genusMycobacterium.

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, resemblingM. 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, onLöwenstein-Jensen orMiddlebrook 7H10 media.^[1]
• Susceptible toethambutol,rifampin andkanamycin.
• Resistant toisoniazid,pyrazinamide andstreptomycin.

Differential characteristics

• Similarities toM. tuberculosis include colony morphology, thermolabile catalase, positivenitrate reductase; differences are negative reactions forniacin production and rapid growth at 30 °C.

• Not known.Biosafety level 1.

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

• Type strain ofMycobacterium fallax at BacDive - the Bacterial Diversity Metadatabase

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