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2. Causes of Bronchiolitis

Bronchiolitis is a common viral infection caused by the respiratory syncytial virus or RSV. This virus spreads easily through droplets in the air when an infected child coughs or sneezes near other children or babies. The infection takes hold in the bronchioles of the lungs, making them inflamed and irritated. This inflammation causes the wheezy breathing and persistent cough.

Kyryl Gorlov / Getty Images
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