Bacteria: Structure and Pathogenesis · USMLE Step 1

Which virulence strategy helps bacteria avoid destruction by phagocytes and reactive oxygen species?

  1. Capsule production
  2. Endospore formation
  3. Flagellar motility
  4. Peptidoglycan cross-linking
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Correct answer: Capsule production

Capsules inhibit phagocytosis and prevent recognition by immune cells. This reduces bacterial clearance by host defenses.

Difficulty: Medium Question 15 of 17

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