Mycobacterium interjectum

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Mycobacterium interjectum
Etymology: Phylogenetic position between (Latin: interjectum) rapidly and slowly-growing mycobacteria.

Gram-positive, nonmotile and acid-fast rods (0.6-1.0µm x 0.7-2.0µm). Filaments (up to 6.0µm) possible.

Colony characteristics Dysgonic, smooth and scotochromogenic colonies (1-2mm 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.

• Chronic lymphadenitis
• Biosafety level 2

• First isolated from a lymph node of a child with chronic lymphadenitis in Germany.

Strain 4185/92 = ATCC 51457 = CCUG 37514 = DSM 44064

• 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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