The book provides a clear, comprehensive and concise account of immunology. This edition has undergone changes in almost all chapters and many have been rewritten to incorporate a new way of understanding concepts. All diagrams have been improved and many new diagrams have been added. This has helped in giving a detailed account of various aspects without any confusion. Many important concepts and clinical correlations and conditions have been highlighted in coloured boxes. The subject matter in the book has been arranged in a sequence to gradually build the concepts along with adequate illustrations, tables and flowcharts. A summary at the end of each chapter gives the important facts for recapitulation.