Anaphylaxis occurs as a result of what type of hypersensitivity?

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Type I, or anaphylactic type, hypersensitivity is a reaction that occurs immediately, within minutes of exposure to a previously encountered antigen or allergen. Type II, or cytotoxic type, hypersensitivity occurs when an antibody combines with an antigen that is bound to the surface of tissue cells. Type III, or immune complex type, hypersensitivity is marked by the formation of immune complexes between microorganisms and antibody in the circulating blood. Type IV, or cell-mediated type, hypersensitivity involves a cell-mediated immune response rather than a humoral response that produces antibodies.

Anaphylaxis Occurs as a Result of What Type of Hypersensitivity