Mycobacterium gordonae

. From left to right:- Negative control- M. tuberculosis: Dry-appearing colonies- Mycobacterium avium complex: Wet-appearing colonies- M. gordonae: Yellowish colonies Gram-positive, nonmotile and moderate to long acid-fast rods. • Commonly found in tap water and soil. Casual resident in human sputum and gastric lavage specimens. Colony characteristics • Smooth, with yellow or orange scotochromogenic colonies. Even though they are scotochromogenic pigment is intensified by growing in continuous light. Physiology • Growth on Löwenstein-Jensen medium and Middlebrook 7H10 agar within 7 or more days at 37 °C (optimal 25 °C). • Does not grow in the presence of ethambutol (1 mg/L), isoniazid (10 mg/L) and sodium chloride (5%). • Some strains can grow using carbon monoxide as a carbon and energy source. Differential characteristics • A commercial hybridisation assay (AccuProbe) to identify M. gordonae exists. • Intraspecies variability in 16S rDNA sequences ==Pathogenesis==

• Rarely if ever implicated in disease processes even if patients are immunocompromised. Widely distributed in environment and usually a contaminant in laboratory specimens. • Biosafety level 2 ==Type strain==

Strain ATCC 14470 = CCUG 21801 = CCUG 21811 = CIP 104529 = DSM 44160 = JCM 6382 = NCTC 10267. == References ==