The second edition of this text has been revised and refocused to reflect the transformation of immunotoxicology from a subdiscipline of toxicology to an independent area of research that can best be described as "environmental immunology." New chapters discuss the role of immune mediators in liver, lung, and skin toxicity, in regulating chemical- metabolizing enzymes, and in the immunosuppression produced by ultraviolet light. More emphasis is placed on the clinical consequences of immunotoxicity, as well as the interpretation of experimental data for predicting, human health risk.; The second edition is divided into three major sections: immunosuppression, autoimmunity, and hypersensitivity. This new organization of the text allows for a more thorough treatment of these phenomena, with greater attention to test methods, theoretical considerations, and clinical implications. The book includes many chapters on specific environmental agents, therapeutic drugs, biological agents, and drugs of abuse, as well as on immune-mediated toxicity in specific organ systems.