Inclusion Criteria:  Children and adolescents aged 3 to 16 years old With a medical diagnosis of asthma as per-guidelines, who had been followed-up for at least 6 months, Assessed in one of the pediatric departments participating in the study, After written consent of at least one of the 2 parents and/or representative of the parental authority, and of the child if he is older than 8 years old.  Criteria for the sub-population assessed at "exacerbation" and second visit:  Children and adolescents aged 3 to 16 years With a medical diagnosis of asthma as per-guidelines, who had been followed-up for at least 6 months, Hospitalized for a severe asthma exacerbation (requiring hospitalization and general corticosteroid therapy) at Lille University Hospital After written consent of both parents and/or representative of the parental authority, and of the child if he is over 8 years old  Exclusion Criteria:  History of chronic respiratory disease other than asthma, Inability of parents to receive informed information, inability to participate in the entire study, refusal to sign the consent form