The Immune System, Third Edition is designed for use in immunology courses for undergraduate, medical, dental, and pharmacy students. This class-tested and proven textbook synthesizes the established facts of immunology into a comprehensible, coherent, and up-to-date account of how the human immune system works and the effects it has on the health and survival of individuals and populations, making generous use of medical examples to illustrate points. The reader-friendly text, full-color illustrations, and section and chapter summaries make the book accessible and easily understandable to students.