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Definition: Disorders caused by abnormal or absent immunologic mechanisms, whether humoral, cell-mediated, or both. Synonym(s): Immune Disorders / Immunologic Diseases / Diseases of Immune System / Immune Diseases /.
Autoimmune disease: An illness that occurs when the body tissues are attacked by its own immune system. The immune system is a complex organization within the body that is designed normally to seek and destroy invaders of the body, including infectious agents.Patients with autoimmune diseases frequently have unusual antibodies circulating in their blood that target their own body tissues.he immune system is a complex organization within the body that is designed normally to seek and destroy invaders of the body, including infectious agents. Patients with autoimmune diseases frequently have unusual antibodies circulating in their blood that target their own body tissues.