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Immune response. A response from the body to an antigen that occurs when the antigen is identified as foreign and that induces the production of antibodies and lymphocytes capable of destroying the antigen or making it harmless.
Allergic Reaction, Immune Hypersensitivity An allergy is an overactive immune response which is triggered when the body is exposed to some stimulus. This causes inflammation at the site of exposure or in other parts of the body and causes a range of symptoms, some of which can be life threatening.