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By Mayo Clinic staffBronchiolitis is a common infection of the lungs' airways, often caused by a virus. It most frequently occurs in infants, commonly between 3 and 6 months of age. Typically, bronchiolitis occurs during the fall and winter months.
Bronchiolitis starts out with symptoms similar to those of a common cold but then progresses to coughing and wheezing.
Although a child's bout of bronchiolitis may be scary, particularly for parents, symptoms typically last for about a week and then go away. In the meantime, you can take a number of self-help measures to make your child more comfortable. In some cases, especially if your child has an underlying health problem, bronchiolitis can become severe and require hospitalization.