Which condition is a classical example of Type IV hypersensitivity?

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Study for the Success! In Clinical Laboratory Science – Immunology Test. Prepare with flashcards and multiple choice questions, each question offers hints and explanations. Get ready for your exam!

Multiple Choice

Which condition is a classical example of Type IV hypersensitivity?

Explanation:
Type IV hypersensitivity is a T cell–mediated, delayed response. After sensitization, re-exposure activates T cells to release cytokines that recruit and activate macrophages, causing tissue inflammation, typically 24–72 hours later. Contact dermatitis is the classic example because it arises from a sensitized T-cell reaction in the skin to substances like nickel or poison ivy. In contrast, allergic rhinitis is driven by IgE antibodies (Type I hypersensitivity), while Graves' disease and myasthenia gravis involve autoantibodies causing tissue damage (Type II hypersensitivity). So the condition described aligns with a T cell–mediated, delayed-type response.

Type IV hypersensitivity is a T cell–mediated, delayed response. After sensitization, re-exposure activates T cells to release cytokines that recruit and activate macrophages, causing tissue inflammation, typically 24–72 hours later. Contact dermatitis is the classic example because it arises from a sensitized T-cell reaction in the skin to substances like nickel or poison ivy. In contrast, allergic rhinitis is driven by IgE antibodies (Type I hypersensitivity), while Graves' disease and myasthenia gravis involve autoantibodies causing tissue damage (Type II hypersensitivity). So the condition described aligns with a T cell–mediated, delayed-type response.

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