This book has been written with the aim to outline the major areas of Immunology i.e. Biochemical, Microbiological, Pathological and Clinical Aspects This book is not merely an addition to the existing list of books on MCQ's but a sincere ambition and an honest attempt to make it a useful and practical companion to both medical graduates and post- graduates. The present book consists of original solved MCQ's from the Question Banks of various important examinations (AIIMS, Delhi, PGI, NIMHANS etc.), Important text, original solved MCQ's and their explanations have been added.