Assessing the Impact of Acute Respiratory Illnesses on the Risk of Subsequent Respiratory Illness.

Background: Whether acute respiratory illnesses (ARIs), often associated with virus detection, are associated with lower risk for subsequent ARI remains unclear. We assessed the association between symptomatic ARI and subsequent ARI in young children.

Methods: In a prospective cohort of Peruvian children <3 years, we examined the impact of index ARI on subsequent ARI risk.