Janeway's Immunobiology is a textbook that introduces the immune system in all its aspects to undergraduates & also provides a treatment of the subject that is comprehensive enough to be useful to graduate students interested in research & to medical students focused on clinical applications. The Eighth Edition has been thoroughly revised & updated & is available in both print & e-book formats. Janeway's Immunobiology continues to set the standard for currency & authority with its clear writing style & organization uniform art program & scientific accuracy. It presents a consistent point of view throughout-that of the host's interaction with an environment containing many species of potentially harmful microorganisms. The full-color art program is conceptually coherent & illustrates the processes & mechanisms underlying the concepts in the text. The 16 chapters in this readable accessible textbook are organized & presented in such a way as to help deliver a complete one-semester immunology course beginning with innate immunity then moving to adaptive immunity & ending with applied clinical immunology. Discussion questions are provided at the end of Chapters 2 to 16. These questions can be used for review or as the basis for discussion in class or in informal study groups. Summaries conclude each section & each chapter. As in previous editions a caduceus icon in the margins indicates topics which are correlated to Case Studies in Immunology Sixth Edition by Geha & Notarangelo. New in the Eighth Edition Innate immunity has been updated & expanded & is now presented in two separate chapters (Chapters 2 & 3) as well as being further emphasized in the rest of the textbook. Chapter 2 covers antimicrobial peptides & the complement system & Chapter 3 deals with cellular innate receptors & cell-mediated innate immunity (e.g. TLRs phagocytosis NK cells interferon production innate-like lymphocytes). The section on complement has been reworked & reconceived-explaining the lectin pathway first-making it easier to teach by placing it into the context of innate recognition. Evolution is now incorporated throughout the text helping students see similar strategies used by different organisms. The text & figures of Chapter 7 Signaling Through Immune System Receptors have been revised to present a cohesive synthesis of signaling for immunology focusing on enhanced illustration of antigen recognition signaling & lymphocyte activation. Signaling through other receptors is dealt with wherever appropriate throughout the book. Updated chapter on B-cell immune responses (Chapter 10) especially on trafficking of B cells in peripheral lymphoid organs (e.g. lymph nodes) & the locations at which they encounter antigen. Coverage of mucosal immunity (Chapter 12) has been brought up to date including responses to the commensal microbiota & the role of specialized dendritic cells & the regulatory T cells in maintaining tolerance to food antigens & commensal bacteria. Chapter 13 Failures of Host Defense Mechanisms has been reorganized & revised to structure an understanding of primary immunodeficiencies in the context of developmental pathways. Chapter 16 Manipulation of the Immune Response has been heavily revised to include a greater emphasis on clinical issues & a complete update of immunotherapeutics & vaccines. Many new & revised figures illustrate the processes & mechanisms underlying the concepts presented in the text. The icons used have been updated & expanded to incorporate a new emphasis on signaling pathways. New references have been added throughout the text.