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Bronchiolitis is a common illness of the respiratory tract caused by an infection that affects the tiny airways, called the bronchioles, that lead to the lungs. As these airways become inflamed, they swell and fill with mucus, making breathing difficult.
Bronchiolitis:
-most often affects infants and young children because their small airways can become blocked more easily than those of older kids or adults
-typically occurs during the first 2 years of life, with peak occurrence at about 3 to 6 months of age
-is more common in males, children who have not been breastfed, and those who live in crowded conditions
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