Bronchiolitis is almost always caused by a viral infection. In most cases, the respiratory syncytial virus (RSV) is responsible.
RSV is a very common virus and almost all children are infected with it by the time they're 2 years old.
In older children and adults, RSV may cause a cough or cold, but in young children it can cause bronchiolitis.
One of my grandsons ended up on a ventilator with it as a very young baby.
Thanks for the info Paspatur 👍
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