Through eight outstanding editions, Middleton’s Allergy: Principles and Practice has been the reference of choice for both clinicians and researchers as both a practical reference and an effective self-assessment tool for board preparation. The 9th Edition continues the tradition of excellence with comprehensive coverage of all basic science and clinical applications regarding allergy practice and disease mechanisms. It brings you fully up to date with recent innovations in the diagnosis, prevention, and management of allergic disorders, including emerging global issues, the advent of precision medicine, and new immunologic therapies.