Mycobacterium kansasii is a bacterium in the Mycobacterium family. The genus includes species known to cause serious diseases in mammals, including tuberculosis and leprosy, but this species is generally not dangerous to healthy people.
, nonmotile, moderately long to long and acid-fast
- Smooth to rough colonies after 7 or more days of incubation.
- Colonies grown in dark are nonpigmented, when grown in light or when young colonies are exposed briefly to light, colonies become brilliant yellow (photochromogenic).
- If grown in a lighted incubator, most strains form dark red crystals of β-carotene on the surface and inside of colony.
- Closely related to the non-pathogenic, also slowly growing, nonpigmented, M. gastri.
- Both species share an identical 16S rDNA but differentiation is possible by differences in the ITS and hsp65 sequences
- A commercial hybridisation assay (AccuProbe) to identify M. kansasii exists.
- First and most frequently isolated from human pulmonary secretions and lesions.
Strain ATCC 12478 = CIP 104589 = DSM 44162 = JCM 6379 = NCTC 13024.
- Hauduroy,P. 1955. Derniers aspects du monde des mycobactéries. Masson et Cie, Paris, 1955.