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Mycobacterium interjectum 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.
Name
Etymology: Phylogenetic position between (Latin: interjectum) rapidly and slowly growing mycobacteria.
Description
Mycobacterium interjectum is Gram-positive, nonmotile and acid-fast rods (0.6-1.0 μm x 0.7-2.0 μm). Filaments (up to 6.0 μm) possible.
Colony characteristics
Dysgonic, smooth and scotochromogenic colonies (1–2 mm in diameter).
Physiology
- Slow growth on Löwenstein-Jensen medium at temperatures between 31°C and 37 °C within 3–4 weeks.
- Susceptible to rifampicin.
- Resistant to isoniazid and ethambutol.
Differential characteristics
- Most closely related to M. simiae.
- Phylogenetic position between rapidly and slowly growing mycobacteria.
Pathogenesis
- Chronic lymphadenitis
- Biosafety level 2
Type strain
- First isolated from a lymph node of a child with chronic lymphadenitis in Germany.
Strain 4185/92 = ATCC 51457 = CCUG 37514 = DSM 44064
References
- Springer et al. 1993. Mycobacterium interjectum, a new species isolated from a patient with chronic lymphadenitis. J. Clin. Microbiol., 31, 3083–3089.
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