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Respiratory Syncytial Virus Infections

An increase in respiratory secretions, as well as other components of the inflammatory reaction, together with the small size of the bronchial tree, contribute to the clinical picture of acute bronchiolitis in young infants. This is characterized by wheezing, cough, fever, and increased respiratory rate. Chest radiographs indicate air trapping, with flattened diaphragms and darkened lung fields, suggestive of radiographs of patients with asthma. In fact, the clinical syndrome may be indistinguishable from an asthmatic attack. Most infections are