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Bronchiolitis is a lung infection that usually affects babies and children under two. It's commonly caused by the respiratory syncytial virus (RSV).

Bronchiolitis and how it affects your child.

Last medically reviewed: September 2019. Due for review: September 2022

This information uses the best available medical evidence and was produced with the support of people living with lung conditions. Find out how we produce our information. If you’d like to see our references get in touch.