Which of the following is a characteristic feature of Mycobacterium tuberculosis infection
Which of the following is a characteristic feature of Mycobacterium tuberculosis infection?
A. Rapid growth on standard culture media
B. Acid-fast staining positivity
C. Gram-positive cocci in clusters
D. Production of endotoxin
E. Susceptibility to penicillin
Answer: B
Explanation: Mycobacterium tuberculosis is an acid-fast bacillus (AFB) due to its thick, lipid-rich cell wall, which retains the primary stain in acid-fast staining. It grows slowly on Lowenstein-Jensen media, is gram-indeterminate, and is resistant to penicillin.
