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Introduction

We have immune functions that protect our bodies by creating antibodies to substances entering the body (antigens) that are foreign and hostile to the body. This is known as the "antigen-antibody reaction" or "immune response." When the same antigen subsequently enters the body, the memorized antibody activates and binds to the antigen to render it harmless. However, if the immune functions go out of control, excess antibodies can be created or harmful antibodies produced in the body. This imbalance causes allergic diseases. Typical allergic diseases include atopic dermatitis, allergic rhinitis (hay fever, etc.), allergic conjunctivitis, allergic gastroenteritis, asthma, childhood asthma, food allergy, drug allergy, and hives. Immunity was originally intended to protect the body from harmful substances. However, for people with a certain disposition, the immune function can activate in response to foods, pollen, dust and other substances which are usually harmless. People predisposed to such symptoms are said to have an "allergic predisposition." When specifi c substances enter the body of a person with an allergic predisposition, the antibodies act abnormally to cause specifi c symptoms.

October 8, 2010 GMT