Which characteristic is unique to Mycobacterium?

Which characteristic is unique to Mycobacterium?

• A. It is a spore former
• B. It survives phagocytosis
• C. It is anaerobic
• D. It is easily killed by antibiotics

Answer: (B)

Mycobacterium are intracellular pathogens that can persist inside macrophages after being engulfed. This survival inside phagocytic cells is enabled by a thick, waxy cell wall rich in mycolic acids, which resists digestion and can interfere with phagosome-lysosome fusion. That combination allows these bacteria to persist and replicate within immune cells, a hallmark feature often tested in questions about their behavior. They do not form spores, so spore formation isn’t a trait of these organisms. They are not anaerobic; they require oxygen to grow. And they aren’t easily killed by antibiotics—treatment typically needs prolonged, multi-drug regimens because the cell wall limits antibiotic penetration and the bacteria can be intracellular.

Mycobacterium are intracellular pathogens that can persist inside macrophages after being engulfed. This survival inside phagocytic cells is enabled by a thick, waxy cell wall rich in mycolic acids, which resists digestion and can interfere with phagosome-lysosome fusion. That combination allows these bacteria to persist and replicate within immune cells, a hallmark feature often tested in questions about their behavior.

They do not form spores, so spore formation isn’t a trait of these organisms. They are not anaerobic; they require oxygen to grow. And they aren’t easily killed by antibiotics—treatment typically needs prolonged, multi-drug regimens because the cell wall limits antibiotic penetration and the bacteria can be intracellular.