MCQs on Immediate and Delayed Hypersensitivity Immediate and delayed hypersensitivity reactions are two distinct immune responses that occur in response to specific triggers, such as allergens or antigens. Immediate hypersensitivity, also known as Type I hypersensitivity, results in an immediate and rapid reaction upon exposure to the trigger. This type of hypersensitivity involves the release of histamine and other mediators, leading to symptoms like itching, swelling, and wheezing. It is crucial to identify and avoid allergens that trigger immediate hypersensitivity reactions to manage symptoms effectively. Delayed hypersensitivity, on the other hand, is characterized by a delayed onset, typically occurring within 24 to 72 hours after exposure. This type of hypersensitivity involves the activation of T cells and the release of cytokines, leading to inflammation and tissue damage. Delay...