Italian Registry of Allergen ImmunoTherapy

Inclusion Criteria: * Age ≥ 1 year * Confirmed diagnosis of allergic rhinoconjunctivitis and/or allergic asthma according to EAACI 2019 guidelines. * Having been followed by the recruiting center for at least one month: this is considered necessary to establish that the patients are truly affected by allergic respiratory disease and are eligible for allergen-specific immunotherapy; in this period, screening tests are carried out to exclude and/or confirm concomitant diseases (comorbidities). In fact, according to the aforementioned EAACI guidelines, a patient can be defined as truly eligible for allergen-specific immunotherapy only after a preliminary phase in which the patient is treated with symptomatic therapy; this observation period allows a correct evaluation of the real adherence and response to therapy, as well as the identification and appropriate treatment of any comorbidity and the possible elimination of aggravating factors. * Having received the prescription of any of the available AIT products in Italy, irrespectively of the selected allergens and the administration route and schedule. Exclusion Criteria: There will no be exclusion criteria, in order to allow a real-life vision of the characteristics of these patients eligible for or treated with allergen-specific immunotherapy.