The most common hypersensitivity reaction is type:

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Type I hypersensitivity reactions, also known as immediate hypersensitivity reactions, are the most common type of hypersensitivity reactions. This type of reaction is typically mediated by IgE antibodies and results in the release of histamine and other inflammatory mediators, causing symptoms such as itching, swelling, and difficulty breathing. Examples of type I hypersensitivity reactions include allergic rhinitis, asthma, and anaphylaxis. Types II, III, and IV hypersensitivity reactions are less common.

The Most Common Hypersensitivity Reaction Is Type