Hypertonic saline for acute viral bronchiolitis: take the evidence with a grain of salt.

Acute viral bronchiolitis (AVB) is the most common lower respiratory tract infection in infancy. It is caused by respiratory viruses, typically by respiratory syncytial virus [3]. Although only 1–2% of children are hospitalised, AVB accounts for a large proportion of paediatric emergency visits and hospitalisations during winter months [4]. An effective treatment would reduce the number of hospitalisations, hospital length of stay (LOS) and their corresponding health costs.