This book deals with autoimmune disease in humans (as opposed to autoimmunity itself). It discusses the biological basis of disease at the molecular, genetic, cellular, and epidemiologic levels. It also describes the clinical problems of diagnosis, prognosis, and treatment. The intended audience includes physicians of all specialties in practice, physicians in training such as house staff and fellows, and medical students. It will also be valuable for basic scientists and graduate students interested in the solution of important clinical problems. The book concentrates on topics that have grown or changed dramatically since publication of The Autoimmune Diseases.