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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.
There are several major components to the immune response. The nonspecific immune response, or inflammation, is the response of the body's tissues and cells to injury from any source, e.g., trauma, organisms, chemicals, ischemia.As the initial response of the immune system to any threat, it involves vascular, chemical, and white blood cell activities. tissue reaction to injury or an antigen that may include pain, swelling, itching, redness, heat, and loss of function. The response may involve dilation of blood vessels and consequent leakage of fluid, causing edema; leukocytic exudation; and release of plasma proteases and vasoactive amines such as histamine.