In Italy, few data about anaphylaxis due to peanuts in pediatric age are available, conversely data about walnuts/hazelnuts, shellfish/mollusks anaphylaxis have not yet been collected.

Children with physician-confirmed food allergy to peanuts, walnuts/hazelnuts and shellfish/mollusks will be recruited from 9 allergy clinics located in the Italian Territory (Bologna, Lecce, Napoli, Palermo, Parma, Pavia, Roma, Torino, Trento).

Parent of food allergic children will compile a food allergy questionnaire (questions about general information on the family, on life and food habits, on indoor environment, on health status, on clinical aspects of the allergy, on the access to diagnostic and treatment resources).

Parent of healthy children will compile a control questionnaire (questions about general information on the family, on life and food habits and on indoor environment) The 1-year survey will determine the frequency of anaphylaxis in allergic outpatient children.

Inclusion criteria

• Cases: 0-14 years old patients with food allergy to peanuts, walnuts/hazelnuts, shellfish/mollusks.
• Controls: 0-14 years old subjects without allergy to peanuts, walnuts/hazelnuts, shellfish/mollusks.

Exclusion criteria

• Patients/subjects in acute phase of disease or with not controlled chronic pathologies;
• missing written informed consent by parents

200 Italian children with or without food allergy