Classification and Pathomechanisms.- Basic Aspects of Allergy and Hypersensitivity Reactions.- Pathogen Recognition and New Insights into Innate Immunity.- New Nomenclature and Clinical Aspects of Allergic Diseases.- IgE and the High-Affinity Receptor, Fc?RI: The IgE-CD23 Interaction.- Superantigens and Allergic Disease.- Immune Complexes: Normal Physiology and Role in Disease.- What Is New About Eosinophil Activation in Asthma and Allergic Disease.-...