In this book the most important papers presented at the 5th Symposium in Immunology, held April 7 - 8, 1995 in Strasbourg, France, are published. Theses papers are from leading experts in the fields covering topics ranging from basic mechanisms, such as the molecular anatomy of autoimmune diseases, to data relevant to the modern diagnosis, therapy, treatment, and prevention of viral infections. By collecting such a wide-range of papers the organizers of the meeting succeeded in compiling an integrated overview of current research, clinical studies, epidemiological data, and their interrelationship.