Which of the following organisms does NOT react with gram's stain ?
Correct answer: C. Mycobacterium tuberculosis
- A. Actinomyces israelii
- B. Candida albicans
- C. Mycobacterium tuberculosis
- D. Streptococcus mutan
Explanation
Mycobacterium tuberculosis has a lipid-rich, mycolic-acid cell wall and is poorly stained by the Gram method, so it is identified by acid-fast staining. Actinomyces and Streptococcus are Gram-positive bacteria, while Candida can also appear Gram-positive.
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