hypersensitivity reactions

hypersensitivity reactions

Immune responses to innocuous antigens that lead to symptomatic reactions upon reexposure are called hypersensitivity reactions. These can cause hypersensitivity diseases if they occur repetitively. This state of heightened reactivity to antigen is called hypersensitivity. Hypersensitivity reactions are classified by mechanism: type I hypersensitivity reactions involve IgE antibody triggering of mast cells; type II hypersensitivity reactions involve IgG antibodies against cellsurface or matrix antigens; type III hypersensitivity reactions involve antigen:antibody complexes; and type IV hypersensitivity reactions are T cell-mediated.

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