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Bronchiolitis: Comorbid, Coexisting, and Differential Diagnosis 

Bronchiolitis: Comorbid, Coexisting, and Differential Diagnosis
Bronchiolitis: Comorbid, Coexisting, and Differential Diagnosis

Kelly J. Cowan

and Theresa W. Guilbert

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date: 20 April 2021

Bronchiolitis is a clinical syndrome in infants and children younger than 2 years that is characterized by airway obstruction and wheezing secondary to lower respiratory tract infection (LRTI) and resulting in inflammation of the small airways (bronchioles). The definition of bronchiolitis may be strictly narrowed to the first episode of wheezing in a child younger than 12 months with physical findings of LRTI and no other etiologies or risk factors associated with wheezing. Underlying disease, including asthma, may coexist with bronchiolitis. The age of the patient, time course of illness, response to treatment, symptom pattern, and presence of asthma risk factors may influence the diagnosis and management of bronchiolitis versus exacerbation of asthma.

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