"Roitt''s Essential Immunology" has established itself as the book of choice for students of immunology worldwide. This excellent textbook is commonly regarded as ''the best of the immunology primers'' and the eleventh edition remains at the cutting edge of this fascinating area of science. The trademark of this book is its highly readable introduction to the subject, its emphasis on core knowledge and its excellent four-color artwork. The internationally renowned authors have extensively updated all aspects of the book to produce a new edition, which will be an invaluable resource to students of immunology and medicine. "Roitt''s Essential Immunology" is supported by a website. This useful on-line resource includes interactive multiple-choice questions with feedback, key concepts explained with animations, further reading lists with PubMed links, and an archive of images from the book.