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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.
The immune response When a foreign substance enters the body for the first time, symptoms of disease may appear while the immune system is making antibodies to fight it. Subsequent attacks by the same antigen stimulate the immune memory to immediately produce large amounts of the antibody originally created.