Bronchiolitis Clearance Airways With Seaserum

Inclusion Criteria: * Infants aged more than 1 month and less than 1 year * First episode of acute bronchiolitis * Emergency consultation * Existence of nasal obstruction * Onset of symptoms \< 48 hours before emergency consultation * Outpatient care after emergency consultation * Mild to moderate bronchiolitis according to the \"Haute Autorité de Santé 2019\" criteria: Respiratory rate over 1 minute \>30/minutes and \<60/minute ; Heart rate \>80/minutes and \<180/minutes; Absence of respiratory pauses; Absence of superficial breathing; Absence of signs of intense respiratory struggle: involvement of the lower intercostal accessory muscles, sternocleidomastoid muscles, thoracoabdominal swinging, or flapping of the wings of the nose; Feeding \>50% of the usual quantity over 3 consecutive doses; SpO2 \> 92% during sleep ; \>94% when awake; \>2 months corrected age * Parental consent * Affiliate to a social security system Exclusion Criteria: * Hospitalization (excluding short stay unit) after emergency consultation * Oxygen therapy * History of prematurity (birth \<36 weeks of amenorrhea) * History of invasive ventilation in the neonatal period * History of chronic pulmonary or cardiac pathology * History of immune deficiency * History of polyhandicap or neuromuscular pathology * History of malformative Ear Nose and Throat pathology affecting the upper airways * Impossibility of ensuring the follow-up made necessary by participation in this study