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Bronchiolitis and RSV

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

Our information covers what bronchiolitis is, the signs and symptoms, how it’s diagnosed and treated, and ways bronchiolitis can be prevented.

Last medically reviewed: November 2021. Due for review: November 2024

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.