Host immune response · USMLE Step 1

A patient is infected with an intracellular pathogen. Which immune component is most important for clearing this infection?

  1. Neutrophils
  2. CD8+ T cells
  3. IgA antibodies
  4. Basophils
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Correct answer: CD8+ T cells

CD8+ cytotoxic T cells kill infected host cells harboring intracellular pathogens. This cell-mediated response is essential for viral control.

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