Aspergillus species are one of the most predominant constituents of aeromycobiota worldwide. They are recognized as important inhalant allergens. This book summarizes the current knowledge about Aspergillus allergens in the etiology of IgE mediated allergic respiratory diseases. It includes information on aerobiology of Aspergillus allergens, their biochemical and clinic-immunologic aspects, diagnosis and immunotherapeutic strategies. This book will be of interest to allergy practitioners, clinicians and researchers.