1. a condition in which the small airways in the lungs become inflamed by a virus. It is most common in infants, who become breathless in severe cases. Recurrent attacks may lead to asthma


  1. Inflammation of the bronchioles, often associated with bronchopneumonia.

  1. An acute viral infection of the bronchioles seen mostly in infants and young children, caused most frequently by the respiratory syncytial virus.
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