Viral infection
This is the first study characterizing the various types of viruses that PICU-admitted patients with acute bronchiolitis can present. For this purpose, we used multiple CRP for respiratory viruses (PneumoVir). RSV remains the most commonly isolated virus in these patients, followed by bocavirus and rhinovirus at much lower percentages. Viral isolation was similar to that of patients from other studies26, with a higher amount of bocavirus. No differences were found in the proportions of isolated viruses among patients according to their parents’ smoking habits. Therefore, viral infection does not appear to explain the greater severity in ETS exposure infants with acute bronchiolitis.