
    removal of adrénaline lots for safety reasons.
  
['children', 'bronchiolitis']
['0.9% saline solution', 'oral betamethasone placebo', 'adrenaline', 'oral betamethasone']

        Inclusion Criteria:

          -  Infants aged 6 weeks to 12 months admitted in paediatric emergency

          -  First episode of acute bronchiolitis defined as: expiratory dyspnea with breath
             slowing and/or sibilants and/or crackles preceded by (or associated with) a
             nasopharyngitis more or less febrile

          -  Respiratory distress assessment index score (RDAI) of 4 to 15 after a nasopharyngeal
             clearance

          -  Agreement of at least one of the parents for his child to participate in biomedical
             research

          -  Affiliation to social security (beneficiary or entitled), except beneficiary of State
             medical help

        Exclusion Criteria:

          -  Prematurity (less than 37 weeks of gestation)

          -  Antecedent of invasive respiratory ventilation during neonatal period

          -  Antecedent of lung or chronic cardiac pathology of wich rhythm disorder, acute
             obstructive cardiomyopathy and coronary insufficiency

          -  Immune deficiency

          -  Active viral infection (hepatitis, zona, herpes, varicella, HIV)

          -  Proven or suspected tuberculosis

          -  Exposure to varicella during 15 days before inclusion

          -  Severe distress (defined as one of following signs: a pulse rate >200/min, respiratory
             rate >80/min, RDAI score >15, neurological disorders)

          -  Nebulization (aerosol spray) of Salbutamol or other bronchodilator treatment during
             the 24 hours before the inclusion

          -  Inhalation (spray) of Salbutamol during the preceding 24 hours

          -  Oral or inhaled corticosteroids during the preceding 2 weeks

          -  Previous episode of wheezing or ascertained diagnosis of asthma

          -  Hypersensitivity to one of the constituting of oral betamethasone

          -  Vaccination by living vaccine during the preceding 2 weeks
      