Your smartwatch could spot the flu before you feel it
NCT ID NCT04772170
First seen Jun 25, 2026 · Last updated Sep 10, 2026 · Updated 3 times
Summary
This study enrolls healthy adults who are already part of a respiratory virus challenge study at the NIH. Participants wear a smartwatch and use a smartphone to track temperature, heart rate, coughs, and other health signals. The goal is to see if these devices can detect subtle changes that indicate infection, potentially leading to earlier diagnosis.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- What this could lead to
- If successful, this could lead to wearable-based early detection tools for respiratory infections like flu and COVID-19.
- What could go wrong
- This is an early observational study, not testing a treatment. The digital biomarkers may not prove reliable enough for real-world diagnosis.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Participants
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About 1,000 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Oct 2023
- Expected to finish
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Jun 2027
An estimate. End dates often move.
- Lead sponsor
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A government research agency
The lead sponsor is the US National Institutes of Health.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
Who is studied
Healthy volunteers currently enrolled in a respiratory virus challenge study
- Ages
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18 to 65 years
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
* INCLUSION CRITERIA: In order to be eligible to participate in this study, an individual must meet all of the following criteria: 1. Able to provide informed consent. 2. Current, recent, or planned enrollment in a respiratory virus challenge study at the NIH Clinical Center. 3. Willing to wear devices as instructed. 4. Willing to participate in monitoring activities as instructed. 5. Willing to have monitoring data stored. 6. Willing to have monitoring data shared with protocol investigators at NIH, University of Washington, and University of Toronto. 7. Willing to have select clinical data from the challenge study such as vital signs, viral shedding, pulmonary function test and/or spirometry results, and clinical symptoms data shared with investigators at University of Washington and University of Toronto. EXCLUSION CRITERIA: An individual who meets any of the following criteria will be excluded from participation in this study: 1\. Any condition that, in the opinion of the investigator, contraindicates participation in this study. Co-enrollment guidelines: Participants must be co-enrolled, planned for co-enrollment, or recently enrolled in a challenge study. Co-enrollment in other studies is restricted but may take place after study staff notification and only with approval of the principal investigator or designee.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
1 site. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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National Institutes of Health Clinical Center
RECRUITINGBethesda, Maryland, 20892, United States
More trials for these conditions
Other studies related to the condition(s) this trial covers.
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- When the immune system Can't fight back: tracking three respiratory viruses
- Flu's journey: scientists track how influenza passes between people
- The Little-Known virus that may rival RSV and flu in older adults
- New coronavirus vaccine candidate enters first human tests
- Can a stronger flu shot boost immunity in older adults?