This study, called the WAVE Study, is looking at how data from wearable devices like smartwatches can help understand respiratory viral infections (RVI), which are illnesses that affect your breathing, like the flu. Researchers want to see if these devices can help tell the difference between people who have symptoms and those who don't. They will collect data from adults during the 2023-2024 flu season in the United States.

Eligibility: Participants must live in the U.S., speak English, and use or be willing to use a device like an Apple Watch, Garmin, or Fitbit. You need to agree to wear the device daily for at least 10 hours and have a smartphone that can run the necessary apps. You will also need to answer surveys and do at-home nasal swab tests.

• This study lasts for 10 weeks.
• Participants need to complete surveys and tests at home.
• Participants cannot join if they have had a recent flu or COVID diagnosis or are in another related study.