Hypersensitivity and Autoimmunity · USMLE Step 1

A patient with Hashimoto thyroiditis produces anti-thyroid peroxidase antibodies. What type of immune process underlies this?

  1. IgE-mediated acute reaction
  2. Antibody-mediated cytotoxicity
  3. Immune complex deposition
  4. T-cell-mediated delayed response
Show answer and explanation

Correct answer: Antibody-mediated cytotoxicity

Hashimoto disease involves Type II hypersensitivity where antibodies target thyroid cells, leading to cell-mediated destruction.

Difficulty: Medium Question 12 of 20

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