Description
Gram-positive, nonmotile and pleomorphic acid-fast rods. Colony characteristics *Bright yellow pigmented, scotochromogenic and rough or smooth colonies on Löwenstein–Jensen medium. Physiology *Fast growth on Löwenstein–Jensen medium at 25 °C and 37 °C within 7 days. No growth at 45 °C. *Resistant to isoniazid, rifampicin, and sodium aminosalicylate. Differential characteristics *Characterised by the possession of 6 species-specific antigens demonstrable in immunodiffusion tests. Pathogenicity.Pathogenesis
Not pathogenic, but evidence insufficient. Biosafety level 1.Type strain
First isolated from cases of human leprosy by C. W. Duval. Strain ATCC 43910 = CCUG 41352 = CIP 104539 = DSM 44244 = JCM 6396 = NCTC 358.References
*Stanford, J. et al. 1971. A study of some fast-growing scotochromogenic mycobacteria including species descriptions of Mycobacterium gilvum (new species) and Mycobacterium duvalii (new species). British Journal of Experimental Pathology, 52, 627–637.]External links