This book provides a comprehensive, up-to-date review of the state of knowledge on the role of microbes in inducing autoimmune diseases. The initial chapters address the basic concept and clinical implications of immunology, while the following section discusses the role of genetics, epigenetics, hormones, stochastic and environmental factors in the pathogenesis of autoimmunity. The third section introduces readers to various autoimmune disorders and presents the cellular and molecular mechanisms of autoimmune diseases. In closing, the book examines the role of intestinal flora in the development of autoimmune diseases, delineates the underlying mechanism responsible for autoimmunity onset, and examines the potential of microbial therapeutics in the prevention and treatment of autoimmune diseases. Given its scope, the book offers a valuable asset for all scientists and clinicians working in immunology, rheumatology and autoimmune diseases.