Which Mycobacterium is niacin-positive?

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Prepare for the Clinical Laboratory Science Bacteriology Test. Engage with multiple choice questions and flashcards with helpful hints and explanations. Ace your exam confidently!

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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