The "Purple Book" is an authoritative, user-friendly guide to almost everything related to immunization. Easy to navigate yet replete with up-to-date information, this handy resource contains practical advice and background on vaccine program infrastructure, standards and regulations, business aspects of vaccine practice, general recommendations, schedules, special circumstances, and how to address the concerns. Specific information about vaccine-preventable diseases, the rationale for vaccine use, and available products is included. The new edition is replete with useful information about COVID-19 vaccines as well as updates on other new vaccines and routine recommendations for 2022. The book is targeted to pediatricians, family practitioners, internists, obstetricians, residents, medical students, nurse practitioners, and physician assistants. The Purple Book is one-stop shopping for everything you need to know in using vaccines to prevent disease and preserve health.