Allergy is a harmful, misguided and over-zealous immune response to antigens that causes tissue damage and disease. It is a form of hypersensitivity, which can be classified into four types, based on the immune reactant, the antigen type and the effector mechanism. Allergic reactions are exaggerated sensitivities (hypersensitive reactions) that occur when your immune system responds abnormally to common substances such as pollen, dust and certain foods. These substances, called allergens, are harmless in a majority of people.
Allergists recognize four types of allergic reactions: Type I or anaphylactic reactions, type II or cytotoxic reactions, type III or immunocomplex reactions and type IV or cell-mediated reactions.
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