What causes bronchiolitis?
A virus is the most common cause of bronchiolitis in babies aged 12 months or younger.
Bacteria can also cause bronchiolitis, but this is rare.
- Respiratory Expert Group. Therapeutic guidelines: Acute bronchiolitis. In: eTG complete [online]. Melbourne: Therapeutic Guidelines Limited, 2012 (accessed 27 March 2012).
- NHS Choices – Bronchiolitis: www.nhs.uk/Conditions/Bronchiolitis/Pages/Introduction.aspx (accessed 27 March 2012).