Bronchiolitis in 15 month old and low oxygen saturation after several days of treatment. causes?

Bronchiolitis: Bronchiolitis is caused by viruses. The most common virus causing severe disease is the RSV or respiratory syncyitial virus. Since your baby continues to show poor oxygenation, especially if the wheezing is severe and he is having difficult breathing, your baby may need to be admitted to the hospital for more intense treatment. Please talk to your pediatrician.

Work of breathing: If the baby seems to be working to breathe, air hungry, please see the Emergency department. Remove nasal mucus and provide cool air mist.

Basics: Bronchiolitis is triggered by a group of viruses. They invade the surface tissues of the airways in the lung & trigger buildup of mucus & debris that blocks small areas of the lung. By blocking tiny air exchange surfaces there is less functioning lung available to gain oxygen. Most at that age will get through it with simple supportive care. Some will require IV fluid & oxygen support.