Which type of hypersensitivity is mediated by T cells and has a delayed onset?

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Multiple Choice

Which type of hypersensitivity is mediated by T cells and has a delayed onset?

T cell–mediated delayed-type hypersensitivity is driven by T lymphocytes rather than antibodies, and it takes time to develop. After first exposure, sensitized T cells respond to the antigen by releasing cytokines that recruit and activate macrophages and other inflammatory cells. This cellular cascade unfolds over a day or two, producing the characteristic delayed reaction rather than an immediate response. Since antibodies aren’t the main players here, you don’t see rapid mast cell degranulation or immune complex–driven inflammation. Classic examples include contact dermatitis from metals or poison ivy and the tuberculin skin test reaction. This described pattern is the delayed-type hypersensitivity, Type IV.

T cell–mediated delayed-type hypersensitivity is driven by T lymphocytes rather than antibodies, and it takes time to develop. After first exposure, sensitized T cells respond to the antigen by releasing cytokines that recruit and activate macrophages and other inflammatory cells. This cellular cascade unfolds over a day or two, producing the characteristic delayed reaction rather than an immediate response. Since antibodies aren’t the main players here, you don’t see rapid mast cell degranulation or immune complex–driven inflammation. Classic examples include contact dermatitis from metals or poison ivy and the tuberculin skin test reaction. This described pattern is the delayed-type hypersensitivity, Type IV.

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