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Hypersensitivity

Hypersensitivity (also called hypersensitivity reaction) refers to undesirable reactions produced by the normal immune system. These reactions may be damaging, uncomfortable, or occasionally fatal. Hypersensitivity reactions require a pre-sensitized (immune) state of the host. The four-group classification was expounded by P. H. G. Gell and Robin Coombs in 1963.

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