Mycobacterium houstonense
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| Mycobacterium houstonense Schinsky et al. 2004, ATCC 49403 |
Mycobacterium houstonense
- Etymology: houstonense, pertaining to Houston, TX, USA, where the first isolate was identified.
- Previously known as Mycobacterium fortuitum third biovariant (sorbitol positive).
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[edit] Description
Gram-positive, nonmotile and acid-fast rods (1-3µm x 0.2-0.4µm).
Colony characteristics
- Usually off-white or cream colored colonies.
- Smooth hemispheric colonies, may be butyrous, waxy, multilobate and even rosette clustered (dilute inocula).
- On malachite green containing media, such as Löwenstein-Jensen, colonies may absorb the green dye.
Physiology
- Rapid growth on Löwenstein-Jensen media within 2-4 days.
Differential characteristics
- The M. fortuitum group consists of 4 closely related taxa: M. fortuitum, M. peregrinum, M. fortuitum third biovariant complex sorbitol positive and M. houstonense. These taxa have minimal differences in susceptibility to antimicrobial agents and produce similar clinical disease.
- Separation, which is clinically less important, is only possible by carbohydrate utilisation profiles and by 16S rDNA sequencing.
[edit] Pathogenesis
[edit] Type Strain
- First isolated in Houston, Texas, USA.
Strain W5198 = ATCC 49403 = DSM 44676.
[edit] References
- Schinsky et al. 2004. Taxonomic variation in the Mycobacterium fortuitum third biovariant complex: description of Mycobacterium boenickei sp. nov., Mycobacterium houstonense sp. nov., Mycobacterium neworleansense sp. nov. and Mycobacterium brisbanense sp. nov. and recognition of Mycobacterium porcinum from human clinical isolates. Int. J. Syst. Evol. Microbiol., 2004, 54, 1653-1667.
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