The Property and Casualty Group is among the oldest in the United States, dating from the founding of our flagship company, Great American Insurance Company, in 1872. The P&C Group is made up of approximately 30 niche specialty insurance industries that focus on specialized commercial products and services for businesses.
autoimmune disease definition. A disease in which the body produces antibodies that attack its own tissues, leading to the deterioration and in some cases to the destruction of such tissue. Discover our greatest slideshows.
Definition [edit]. For a disease to be regarded as an autoimmune disease it needs to answer to Witebsky's postulates (first formulated by Ernst Witebsky and colleagues in 1957 and modified in 1994): 1  Direct evidence from transfer of disease-causing antibody or disease-causing T lymphocyte white blood cells.or a disease to be regarded as an autoimmune disease it needs to answer to Witebsky's postulates (first formulated by Ernst Witebsky and colleagues in 1957 and modified in 1994): 1  Direct evidence from transfer of disease-causing antibody or disease-causing T lymphocyte white blood cells.