In which population and at which time is it most common?
Primarily affects children < 2 years of age
Peak incidence: 2–6 months of age
Common during winter months
What is the most common cause of bronchiolitis?
respiratory syncytial virus (RSV)
List less common causes.
Parainfluenza virus
Influenza virus
Adenovirus
Rhinovirus
Coronavirus
Metapneumovirus
List risk factors for severe bronchiolitis.
Age < 12 weeks
Preterm birth (< 34 weeks' gestational age)
Congenital heart or lung disease
Neurological disease
Immunodeficiency
Exposure to tobacco smoke
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