This book fills a gap at the interface of fundamental and clinical immunology, and allergy. For many years, experts in fundamental immunology and physicians involved in clinical immunology and allergy worked separately   but the fundamental immunologists did not have medical qualifications and the physicians were not involved in the field of fundamental research. Written by a teacher and an expert in both fields, this book combines current knowledge on basic immunology and immunopathology with clinical comments that complete the whole picture.Immunology is a complex science, which requires a simplified approach in order to be taught and understood effectively. This book is based on the authors  long experience in teaching undergraduate, postgraduate students and interns both basic and clinical immunology.