The delay in Type IV hypersensitivity occurs because the allergy is due to the action of _____.

Question

Quizplus · Accepted Answer

Type IV hypersensitivity is also known as delayed hypersensitivity because it takes several days for the reaction to occur. This is because the allergy is due to the action of T cells, specifically CD4+ Th1 cells and CD8+ cytotoxic T cells. These cells release cytokines that activate macrophages and cause tissue damage. B cells, histamine, and mast cells are not involved in Type IV hypersensitivity.

The Delay in Type IV Hypersensitivity Occurs Because the Allergy