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Hypersensitivity, Immediate
Atopic Hypersensitivities; Hypersensitivities, Atopic; Hypersensitivities, IgE-Mediated; Hypersensitivities, Immediate; Hypersensitivities, Type I; Hypersensitivity, IgE-Mediated; IgE Mediated Hypersensitivity; IgE-Mediated Hypersensitivities
Hypersensitivity reactions which occur within minutes of exposure to challenging antigen due to the release of histamine which follows the antigen-antibody reaction and causes smooth muscle contraction and increased vascular permeability.