- Infants with chronic diseases, such cardiorespiratory disease, cystic fibrosis or neonatal asthma, malignancy or immunodeficiency will be excluded, as will be infants in severe distress (respiratory rate >80breaths/min, heart rate >200beats/min, BCD score >13, SpO2). Infants who had recovered from chronic neonatal lung disease of prematurity will be included. In addition, we will excluded infants who had received corticosteroids or bronchodilators in any form within 14 days before presentation and infants whose parents refused to participate or were unable to complete the Bronchiolitis Caregiver Diary Score.