Host immune response · USMLE Step 1

A patient with parasitic worm infection shows elevated eosinophil levels. Which immunoglobulin drives eosinophil activation?

  1. IgA
  2. IgM
  3. IgE
  4. IgG
Show answer and explanation

Correct answer: IgE

IgE binds to eosinophils, facilitating degranulation and parasite killing. This is characteristic of helminth responses.

Difficulty: Medium Question 6 of 20

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