Translational Autoimmunity: Etiology of Autoimmune Diseases is the first volume of the Translational Immunology book series. To attain its purpose as a detailed translational step to tackle autoimmunity, this volume sufficiently addresses basic questions on how the immune system is designed to distinguish self from nonself. It discusses the known mechanisms that lead to the maintenance of self-tolerance, presents potential triggers and malfunctions that impede normal immune processes, and demonstrates how the immune system induces an autoreactive state that results in the recognition of self-antigens seen in autoimmune conditions.