Respiratory Dysbiosis in Preschool Children with Asthma: Predictive of a Severe Form

At inclusion (day 0), stools will be collected with a kit for to remove to 5 mg for each patient.

Blood sample taken during inclusion (day 0) will be collected. There is between 19 and 26 mL for each patient.

At inclusion (day 0), bronchial aspiration after inhalation induction of 4 mL of 6% salt serum administered (after 200 μg of salbutamol via an inhalation chamber during a bronchial drainage session).

At inclusion (Day 0), patients will be taken nasal swab for virology with swab adapted for nasal swab or with suction trap when blowing the child's nose (depending on center practice)and multiplex PCR.