Micro & Immunology · single question
A 10-year-old child received local anesthesia and developed diarrhea, nausea, vomiting, and rash immediately after. What is the diagnosis?
Show answer and explanation
Correct answer: A. Type IV hypersensitivity reaction
- A. Correct. Immediate-onset systemic symptoms (GI upset + rash) after allergen exposure indicate IgE-mediated Type I hypersensitivity (anaphylactic/allergic reaction).
- B. Incorrect. Type II (cytotoxic) involves antibody-mediated cell destruction (hemolytic anemia) — not this acute multi-system presentation.
- C. Incorrect. Type III (immune complex) causes serum sickness typically 7–14 days after exposure, not immediate.
- D. Incorrect. Type IV (delayed/cell-mediated) takes 48–72 hours, not immediate onset.
Sources disagree on the answer to this question. Check a trusted reference.
Practice Micro & Immunology questions Micro & Immunology study notes