Classification of Mycobacterium:
[A] Species always considered pathogens in humans:
- Mycobacterium tuberculosis: Causes tuberculosis in humans.
- Mycobacterium bovis: Causes tuberculosis in humans and cattle, spreads to many by cow’s milk.
- Mycobacterium leprae: Causes leprosy in humans.
[B] Atypical Mycobacteria: Opportunist pathogens in humans. Classification in to four groups:
- Rapid growers.
[C] Saprophytic Mycobacterium: Not associated with human disease. E.g. M. Smegmatis, M.Phlei.