<unk>  is one of the most common diseases.<unk> out 5% of adults are affected and<unk> out 6% of children have at least one episode a year. It occurs more often in the winter. In infants under one year of age,<unk>  was the most common reason for admission to the hospital after an emergency department visit in the US in 2011.
Acute bronchitis
Chronic obstructive pulmonary disease
Bronchitis kettle
Bronchiectasis
Dust pneumonia
Bronchiolitis
Atypical pneumonia
Asthma