Mycobacterium abscessus
| Mycobacterium abscessus | |
|---|---|
| Scientific classification | |
| Kingdom: | Bacteria |
| Phylum: | Actinobacteria |
| Order: | Actinomycetales |
| Suborder: | Corynebacterineae |
| Family: | Mycobacteriaceae |
| Genus: | Mycobacterium |
| Species: | M. abscessus |
| Binomial name | |
| Mycobacterium abscessus Kusonoki and Ezaki 1992 ATCC 19977 |
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Mycobacterium abscessus is a rapidly growing mycobacterium that is a common water contaminant. It was until recently (1992) thought to be a subspecies of Mycobacterium chelonae. M. abscessus can cause chronic lung disease, post-traumatic wound infections, and disseminated cutaneous diseases, mostly in patients with suppressed immune systems.
It is classified as a rapid growing mycobacterium.[1]
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Description [edit]
M. abscessus cells are Gram-positive, nonmotile, acid-fast rods of about 1.0 - 2.5 µm long by 0.5 µm wide. They may form colonies on Löwenstein-Jensen media that appear smooth or rough, white or greyish and nonphotochromogenic.
Physiology [edit]
M. abscessus shows growth at 28°C and 37°C after 7 days but not at 43°C. It may grow on MacConkey agar at 28°C and even 37°C. It shows tolerance to saline media (5% NaCl) as well as 500 mg/l hydroxylamine (Ogawa egg medium) and 0.2% picrate (Sauton agar medium). Strains of the species have been shown to degrade the antibiotic p-aminosalicylate. M. abscessus has also been shown to produce arylsulfatase but not of nitrate reductase and Tween 80 hydrolase. It shows a negative result for the iron uptake test and no utilisation of fructose, glucose, oxalate or citrate as sole carbon sources.
Differential characteristics [edit]
M. abscessus and M. chelonae can be distinguished from M. fortuitum or M. peregrinum by their failure to reduce nitrate and to take up iron. Tolerance to 5% NaCl in Löwenstein-Jensen media, tolerance to 0.2% picrate in Sauton agar, and non-utilisation of citrate as a sole carbon source are characteristics that distinguish M. abscessus from M. chelonae. M. abscessus and M. chelonae sequevar I share an identical sequence in the 54-510 region of 16S rRNA, though both species can be differentiated by their hsp65, ITS or rpoB gene sequences.
Pathogenesis [edit]
M. abscessus may cause chronic lung disease, post-traumatic wound infections, and skin infections in immunodeficient patients.
It can be associated with middle ear infections (otitis media).[2]
Type strain [edit]
ATCC 19977 = CCUG 20993 = CIP 104536 = DSM 44196 = JCM 13569 = NCTC 13031
References [edit]
- ^ Esteban J, Ortiz-Pérez A (December 2009). "Current treatment of atypical mycobacteriosis". Expert Opin Pharmacother 10 (17): 2787–99. doi:10.1517/14656560903369363. PMID 19929702.
- ^ Linmans JJ, Stokroos RJ, Linssen CF (September 2008). "Mycobacterium abscessus, an uncommon cause of chronic otitis media: a case report and literature review". Arch. Otolaryngol. Head Neck Surg. 134 (9): 1004–6. doi:10.1001/archotol.134.9.1004. PMID 18794448.
- Kusunoki,S.,T. Ezaki. 1992. Proposal of Mycobacterium peregrinum sp. nov., nom. rev., and elevation of Mycobacterium chelonae subsp. abscessus (Kubica et al.) to species status: Mycobacterium abscessus comb. nov. Int. J. Syst. Bacteriol. 42, 240-245.
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