Type 1 (Anaphylactic) Hypersensitivity Reaction
Hypersensitivity is increased reactivity or increased sensitivity by the animal body to an antigen to which it has been previously exposed. The most widely adopted current classification is that of Coombs and Gellthat designates immunoglobulin-mediated (immediate) hypersensitivity reactions as types I, II, and III, and lymphoid cell-mediated (delayed-type) hypersensitivity/cell-mediated immunity as a type IV reaction. A hypersensitive response (HR) is …