ILI Labels and Longitudinal Novel Engagement with Symptom Surveillance (ILLNESS) Study

This study was a prospective observational study, and had lasted approximately 7 months in duration. Participants were asked to complete a weekly survey online asking about their influenza-like-illness (ILI) experience over the past 7 days. The primary objective of this study was to collect a population-wide, longitudinal dataset of ILI events (with onset and recovery dates) and the associated symptoms, behaviors, and medical information associated with each event.