Which cell type primarily mediates 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 cell type primarily mediates Type IV hypersensitivity?

Explanation:
Type IV hypersensitivity is mediated by T lymphocytes. This delayed-type reaction is driven by sensitized T cells recognizing antigen presented by APCs and releasing cytokines that activate macrophages and recruit other inflammatory cells. The result is a localized, cell-driven inflammatory response rather than antibody-mediated damage. B lymphocytes, eosinophils, and basophils play major roles in other types of hypersensitivity or allergic responses, but they are not the primary effectors in Type IV. Clinical examples like the tuberculin skin test or contact dermatitis illustrate the T-cell–driven nature of this reaction.

Type IV hypersensitivity is mediated by T lymphocytes. This delayed-type reaction is driven by sensitized T cells recognizing antigen presented by APCs and releasing cytokines that activate macrophages and recruit other inflammatory cells. The result is a localized, cell-driven inflammatory response rather than antibody-mediated damage. B lymphocytes, eosinophils, and basophils play major roles in other types of hypersensitivity or allergic responses, but they are not the primary effectors in Type IV. Clinical examples like the tuberculin skin test or contact dermatitis illustrate the T-cell–driven nature of this reaction.

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