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Medical Term:

delayed allergy


a type IV hypersensitivity allergic reaction; so called because in a sensitized subject the reaction becomes evident hours after contact with the allergen (antigen), reaches its peak after 24–48 hours, then recedes slowly. Associated with cell-mediated responses.

See Also: delayed reaction, delayed hypersensitivity

© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.