Immunology is the branch of medical science which deals with the study of the immune system and related issues. It generally studies the problems such as hypersensitivity, transplant rejection, autoimmune diseases, immune deficiency, etc. It has applications in wide variety of fields such as bacteriology, oncology, psychiatry, parasitology, and dermatology. Clinical immunology studies the problems caused by dysfunction of the immune system. This book is a compilation of chapters that discuss the most vital concepts and emerging trends in this field. It aims to shed light on some of the unexplored aspects of this subject and recent researches in this area. The studies collated in this book have been contributed by immunologists, researchers and veterans from across the globe. For all those who are interested in clinical immunology, this book will prove to be an essential guide.