Micro & Immunology · single question
Anaphylaxis is which type of hypersensitivity reaction (and what is its timing)?
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Correct answer: A. Type I — immediate
- A. Correct. Anaphylaxis is a type I, IgE-mediated, IMMEDIATE hypersensitivity reaction (mast cell/basophil degranulation within minutes). Treat with intramuscular epinephrine.
- B. Type II is cytotoxic, not the basis of anaphylaxis.
- C. Type III is immune-complex mediated.
- D. Type IV is delayed and T-cell mediated.
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