We thank Drs Jartti and Ruuskanen for clarifying and emphasizing important considerations concerning the burden of influenza among young children. Consistent with their work on respiratory viruses and asthma exacerbations in children and that of others, we also have found that rhinoviruses are commonly identified among hospitalized children with asthma. Although rhinoviruses and other viruses are more commonly identified among hospitalized children with asthma exacerbations than influenza, we focused on influenza because it is the only respiratory virus for which a vaccine and antiviral medications currently are available. Our work, along with that of others, demonstrates that children with asthma have an increased burden of medically attended visits associated with influenza as compared with healthy children.2–6  However, we acknowledge that our understanding of why children have this extra burden of influenza needs additional study. If social or perceptional factors, rather than asthma exacerbations, contribute to this...

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