Allergic diseases have dramatically increased in prevalence in recent decades. However, while the genetic basis and the mechanisms of the allergic reaction are becoming ever clearer to researchers, there is still a tremendous gap between research results and actual practice in many allergists' offices. This volume provides much-needed help. Every two years, 200 of the world's leading allergists gather for an intimate and friendly symposium organized by the Collegium Internationale Allergologicum to discuss cutting-edge results of allergy research and future therapeutic options. This volume collects a series of excellent papers presented there, covering topics such as gene-environment interaction, T cell regulation, basic mechanisms of effector cell function, mast cells, psychoneuroallergology, asthma, food allergy, eczema, drug reactions, diagnostics and the latest progress in pharmacotherapy, as well as nonspecific and specific immunotherapy.