The field of allergy and clinical immunology is concerned with researching, managing and preventing allergic diseases and disorders that involve the immune system to a greater or lesser extent and thus incorporates the practical aspects of immunotherapy and immunosuppression. Allergies, for examples respiratory allergies and food allergies, are very common and affect around a third of the population. Immunological disorders such as systemic and organ-specific autoimmune disorders and immunodeficiency in children and adults are less common, but have a serious impact on the lives of those affected. As this field of medicine is not tied specifically to a single organ it requires a holistic overview of the patient and thus close interdisciplinary collaboration between primary care providers, allergy and immunology specialists and other specialists.