Objective: To determine the prevalence of rhinovirus infection in hospitalized young infants with acute bronchiolitis.Methods: Hospitalized children with acute bronchiolitis admitted to the Hospital São Lucas/PUCRS between May and September 2002 were selected prospectively. Nasopharyngeal samples were assayed for respiratory syncytial virus, parainfluenza, influenza and adenovirus by immunofluorescence. For rhinovirus test a reverse transcriptionpolymerase chain reaction for picornavirus was used, followed by hybridization with rhinovirus specific probes.Results: Forty-five patients were selected for the study. The median age of the subjects studied was 2 months. Positive samples for respiratory viruses were found in 35/45 (77.8%) subjects and 7/35 (20%) patients had dual infection. Respiratory syncytial virus was detected in 33/35 (94%) cases. Rhinovirus was detected in 6/35 patients (17%).Conclusions: Rhinovirus was the second most common agent detected in nasal secretions from young infants hospitalized with acute bronchiolitis.
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