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Misdirected immunity with the production of antibodies that act against the tissues of the body itself.


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  1. Autoimmunity is defined as an immune response leading to reaction with self antigen, i.e. any molecule that is a normal body constituent of the animal mounting the response.
  2. Misdirected immunity with the production of antibodies that act against the tissues of the body itself.
  3. A misdirected immune response that occurs when the immune system goes awry and attacks the body itself.


Self-defense is present in everyone and is generally harmless. However, autoimmunity can lead to a wide range of human diseases, collectively known as autoimmune diseases. Autoimmune diseases occur when benign autoimmunity increases pathogenic autoimmunity. This development is determined by genetic effects as well as by environmental stimuli.

Autoimmunity is evidenced by the presence of autoantibodies (antibodies directed against these individuals) and the presence of T cells that interact with the host antigen.

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