Is bronchiolitis contagious to both children and adults?

Bronchiolitis. Bronchiolitis is usually a disease of children less than 18 months. If adults get the bronchiolitis virus it is often a simple cold. If there is wheezing on older children and adults, particularly if reoccurring it is likely asthma.
Yes. It is likely a viral infection and it is transmitted by respiratory droplets. Bronchiolitis is a disease of early childhood. But the same virus can cause a bad cold in an adult or older child.
YES IT IS. Bronchiolitis is contagious more so to children and babies In children and babies it is caused by RSV Virus and in adults it may be caused by other viruses.