Which type of hypersensitivity reaction is responsible for rapid anaphylaxis after exposure to an allergen?
Correct answer: B. Type I, IgE-mediated reaction
- A. Type II, antibody-mediated cytotoxic reaction
- B. Type I, IgE-mediated reaction
- C. Type III, immune-complex reaction
- D. Type IV, delayed cellular reaction
Explanation
Anaphylaxis is a type I hypersensitivity reaction involving allergen-specific IgE bound to mast cells and basophils. Re-exposure causes mediator release, leading to vasodilation, bronchoconstriction, and other acute signs. Type IV reactions are delayed and primarily cell mediated.
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Covers the recognition, diagnosis, prevention and medical treatment of diseases affecting domestic animals, including infectious, metabolic, nutritional, toxic and organ-system disorders. It links history taking, physical examination, clinical signs, laboratory findings and differential diagnosis with appropriate therapy and herd or flock control.
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