Bronchiolitis is a viral disease of the lungs most common in young children. The virus causes swelling airways in the small airways of the lungs, called bronchioles, and a build up of mucus in the airways. This can make breathing more difficult and lead to coughing and wheezing.

Bronchioles
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Bronchiolitis is caused by one of several different types of viruses. These viruses are easily spread from person to person like a common cold. It is passed most easily through droplets of moisture that are released into the air with coughs or sneezing. These droplets may be inhaled by others or land on common surfaces like counters and doorknobs. A healthy person can pick up the virus by inhaling it in the air or coming in contact with the virus on surfaces then touching their face.