Textbooks of vaccines are too lengthy and unsuitable for quick references. For the practitioner, having all this information in a concise and easily readable form is a necessity.  With this objective, the Indian Academy of Pediatrics (IAP), has published this comprehensive book in a question and answer format, brief enough to be easily readable and with adequate information to answer all the questions.  Each chapter has been authored by experts in the field of vaccinology drawn from all over the country. These experts have delved into the literature about vaccines and formulated these all-inclusive chapters.