Type I hypersensitivity, also known as immediate hypersensitivity, is an exaggerated immune response mediated by immunoglobulin E (IgE) antibodies, leading to rapid allergic reactions upon exposure to allergens. This type of hypersensitivity is characterized by the release of histamines and other inflammatory mediators from mast cells and basophils, causing symptoms such as itching, swelling, and bronchoconstriction. It plays a crucial role in allergic conditions like asthma, hay fever, and anaphylaxis.
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