This book offers a comprehensive review of allergy and immunology, specifically dedicated as a board review preparation. The book is a collective effort and participation of over 90 well known allergists, immunologists, and rheumatologist who are academician and or practitioners. Chapters are presented in a " Case-Based" format. Each chapter presents 2 cases; each case is followed by multiple choice questions/ answers and discussions. Each chapter also offers a list of specific references used in the text, that will enhance the readers' portfolio of resources.