Immediate hypersensitivity reactions are mediated by IgE secreted by B cells, whereas delayed hypersensitivity is mediated by T cells.

Question

Quizplus · Accepted Answer

Immediate hypersensitivity reactions involve the activation of mast cells and basophils through crosslinking of IgE bound to their surface, which leads to the release of inflammatory mediators. In contrast, delayed hypersensitivity reactions occur when sensitized T cells encounter the allergen and release cytokines that activate inflammatory cells and recruit more immune cells to the site of the reaction.

Immediate Hypersensitivity Reactions Are Mediated by IgE Secreted by B