Mycobacterium houstonense

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Mycobacterium houstonense

Scientific classification

Kingdom:	Bacteria
Phylum:	Actinobacteria
Order:	Actinomycetales
Suborder:	Corynebacterineae
Family:	Mycobacteriaceae
Genus:	Mycobacterium
Species:	M. houstonense

Binomial name

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).

1 Description
2 Pathogenesis
3 Type Strain
4 References

[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.