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Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...

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Related Experiment Video

Updated: Jul 2, 2026

Color Spot Test As a Presumptive Tool for the Rapid Detection of Synthetic Cathinones

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Published on: February 5, 2018

Late patch test reaction to dichlorophene

O Barbuzza¹, F Guarneri, G Galtieri

¹University of Messina, Institute of Occupational Health, Messina, Italy.

Journal of Investigational Allergology & Clinical Immunology

|August 22, 2008

Summary

No abstract available in PubMed .

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