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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 /.
Disorders of the immune system can result in autoimmune diseases, inflammatory diseases and cancer, according to the NIH. Immunodeficiency occurs when the immune system is not as strong as normal, resulting in recurring and life-threatening infections, according to the University of Rochester Medical Center.