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immediate hypersensitivity
antibody-mediated hypersensitivity occurring within minutes when a sensitized individual is exposed to antigen; clinical manifestations
may include any of various atopic allergy conditions (such as asthma, dermatitis, rhinitis, or urticaria) or sometimes anaphylaxis. Later exposure to the antigen triggers production and release of various mediators of hypersensitivity that act on other
cells to produce symptoms such as bronchospasm, edema, mucous secretions, and inflammation.

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