The clinical condition of this infant is consistent with acute bronchiolitis. RSV is the most common organism associated with acute bronchiolitis, but other organisms, such as adenovirus and M. pneumoniae, may produce a similar clinical picture. Peak incidence usually occurs at age 2 to 8 months. Tachypnea is the most common physical sign of acute bronchiolitis. Hypoxia indicates severe illness and requires hospitalization.
