Discussion
Which one of the following species of Mycobacteria is generally regarded as non-pathogenic ?
Answer: B
The non-pathogenic species is Mycobacterium smegmatis.
M. smegmatis is a fast-growing, saprophytic mycobacterium found in soil and water. Because it is generally harmless and grows quickly, it is used as a laboratory model for its slow-growing relatives.
The other three are well-known pathogens: M. tuberculosis causes tuberculosis in humans, M. bovis causes bovine tuberculosis and can infect humans, and M. leprae causes leprosy.
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