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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 occurring on the first exposure to a foreign material in the body. This reaction is by both the innate and acquired immune system, the innate acting first (non specific) and the acquired developing to produce antibodies and T killer cells specific to the invading microorganism.