Which Mycobacterium is niacin-positive?

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Prepare for the Clinical Laboratory Science Bacteriology exam. Utilize flashcards and multiple choice questions, complete with hints and explanations for each query. Ace your exam!

Multiple Choice

Which Mycobacterium is niacin-positive?

Explanation:
Niacin production is a biochemical feature used to differentiate certain Mycobacterium species. M. tuberculosis commonly synthesizes and accumulates niacin during growth, so a positive niacin test points to its presence. The other species listed—M. kansasii, M. gordonae, and M. bovis—typically do not accumulate detectable niacin, giving a negative result. Thus, niacin-positive identifies M. tuberculosis.

Niacin production is a biochemical feature used to differentiate certain Mycobacterium species. M. tuberculosis commonly synthesizes and accumulates niacin during growth, so a positive niacin test points to its presence. The other species listed—M. kansasii, M. gordonae, and M. bovis—typically do not accumulate detectable niacin, giving a negative result. Thus, niacin-positive identifies M. tuberculosis.

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