CClinicalTrials.gg
TerminatedNCT04912180ARSUpdated Jul 14, 2021

Apple Respiratory Study

An observational study in Acute Respiratory Infection, Coronavirus Infection and Influenza, sponsored by Apple Inc.. Terminated at 1 site in United States. Open to participants aged 22 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2021-07-14.

Sponsored by Apple Inc. · Observational

Why this study was terminated
Study endpoints no longer feasible.
Study type
Observational
Model
Ecologic or community
Time perspective
Prospective
Enrollment
108
Ages
22 Years and older
Sex
All
01

Study summary

The Apple Respiratory Study, a collaboration between researchers at Apple Inc. (the "Study Sponsor" or "Sponsor") and the Seattle Flu Study team at the University of Washington (UW) (the "UW Study Team"), is a prospective, longitudinal cohort, low risk Study to collect certain data from Apple Watch and iPhone to determine whether such data can detect physiologic and non-physiologic changes in individuals associated with respiratory illnesses due to influenza, SARS-CoV-2 and other respiratory pathogens (the "Study").

Read the detailed description

Initial Screening and Study enrollment will begin in 2021 among adults residing in the Greater Seattle area. Participants will be recruited and driven to the online Study Website managed by UW. If determined to be eligible following completion of the Prescreen Consent and an initial eligibility assessment via REDCap, potential participants will be asked to review and, if interested in participation, to complete the Main Study Consent via REDCap, as well as to engage in enrollment procedures across both REDCap and the Apple Research app. Redcap will be used for prescreening, enrollment survey, and kit activation survey. Participants will use the Apple Research app to complete onboarding surveys, weekly symptom surveys, illness follow-up surveys, and monthly lifestyle surveys. These surveys will help the investigators learn about onset of respiratory symptoms as well as sick contacts, flu and/or COVID-19 vaccination and risk factors for illness. Participants will also receive an Apple Watch to capture certain sensor data-which, along with iPhone sensor data, will be correlated with symptom onset and symptom trajectory. If a participant experiences an acute respiratory illness (ARI), defined as at least one respiratory symptom for at least 24 hours, that individual will be asked to complete a symptom onset survey and self-collect an anterior nasal swab, which will be sent to UW Laboratory Medicine for analysis. Participants will be able to access their COVID swab test results using a secure web portal. Additionally, individuals who test positive or inconclusive for SARS-CoV-2 will be notified via phone by the UW Study Team and given instructions as defined by and in accordance with state, local, and national public health guidance.

02

Conditions studied

  • Acute Respiratory Infection
  • Coronavirus Infection
  • Influenza
03

In context

Infections

6,687 studies on the registry are indexed under Infections; 807 are open to participants now.

This study's enrollment of 108 is below the median of 240 across 2,136 observational studies indexed under Infections.

Browse Infections studies →

Lead sponsor

Apple Inc. is the lead sponsor of 12 studies on the registry; 2 are open to participants now.

Of its 6 completed or terminated interventional studies of FDA-regulated products, 6 (100%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
22 Years and older
Sexes eligible
All
Accepts healthy volunteers
Yes
Sampling method
Probability sample

Study population

The Study aims to enroll up to 1000 adults. We estimate that we will detect approximately 70 laboratory confirmed influenza cases and 40 laboratory confirmed SARS-CoV-2 cases based on estimated event rate incidences.

Inclusion criteria

To participate in this Study, individuals must:

  • Have access to an iPhone 6s or later with compatible iOS as defined by the Apple App Store.
  • Have regular and reliable internet access
  • Be willing to comply with all Study procedures, including regular use of the Apple Watch (daytime and nighttime), complete the REDCap and Apple Research app surveys, share data from required Apple Watch and iPhone sensors, and perform self-collected nasal swabs
  • Be able to read and comprehend English
  • Be able to provide informed consent without the use of a legally authorized representative
  • Have a permanent mailing address in the greater Seattle area where Study materials can be mailed
  • Be at least 22 years old at the time of consent

Exclusion criteria

Exclusion Criteria:

To participate in this Study, individuals must not:

  • Have previously tested positive for SARS-CoV-2 via PCR or antibody test
  • Currently be enrolled in University of Washington Husky Coronavirus Testing, Household Observation Study, or any other Seattle Flu Study sub-Study
  • Have received any vaccine for COVID-19 or have an upcoming appointment for at least one dose of any COVID-19 vaccine prior to Study consent

Individuals also may be excluded from the Study once target participant counts have been achieved for certain demographics, comorbidity groups, and/or residence based on zip code

05

Study design

Observational model
Ecologic or community
Time perspective
Prospective
Enrollment
108 participants (actual)
Patient registry
No
06

What researchers measure

Primary outcomes

  1. Symptomatic individuals that self-report ARI and have a laboratory-confirmed positive test for SARS-CoV-2 and/or influenza within 72 hours

    Proportion of symptomatic individuals that self-report ARI and have a laboratory-confirmed positive test for SARS-CoV-2 and/or influenza by self-swab within 72 hours of symptom onset.

    Time frame: Up to 6 months

Secondary outcomes

  1. Self-report ARI and positive test for SARS-CoV-2 and/or influenza within 7 days

    Proportion of symptomatic individuals that self-report ARI and have a laboratory-confirmed positive test for SARS-CoV-2 and/or influenza by self-swab within 7 days of symptom onset.

    Time frame: Up to 6 months

  2. Self-report ARI and test positive for other ARI within 7 days of symptom onset

    Proportion of symptomatic individuals that self-report ARI and test positive for another respiratory pathogen by self-swab within 7 days of symptom onset

    Time frame: Up to 6 months

  3. Onset of ARI event

    Onset of ARI event defined as date and time of first self-reported symptoms (Day 0)

    Time frame: Up to 6 months

  4. Hand washing Sessions

    Completed hand washing sessions per week as detected by Apple Watch

    Time frame: Up to 6 months

  5. Measure of Heart Rate

    Measure of Heart Rate in Heart Beats per minute

    Time frame: Up to 6 months

  6. Measure of Heart Rate Variability

    Measure of Heart Rate Variability in the standard deviation in the time interval between heart beats in milliseconds over variable periods of time.

    Time frame: Up to 6 months

  7. Measure of Blood Oxygen

    Measure of Blood oxygen or oxygen saturation -percentage of hemoglobin in your red blood cells carrying oxygen (taken from Apple Watch)

    Time frame: Up to 6 months

  8. Nasal swab sample that returns with no pathogens (viral and bacterial) on the panel

    Pathogen-negative ARI (pathogen not detected by laboratory testing; "pathogen negative ARI" could be due to chronic respiratory diseases, viral clearance, or inadequate sample collection)

    Time frame: Up to 6 months

  9. RNaseP and viral CRT values

    RNaseP and viral CRT values for laboratory-confirmed virus positive ARI episodes

    Time frame: Up to 6 months

  10. Duration of viral shedding and viral loads

    Duration of viral shedding and viral loads in COVID-positive patients as assessed by four swabs collected over two weeks of follow-up

    Time frame: Up to 6 months

  11. ECG Reports

    Wrist-based Electrocardiogram (ECG) from smart watch containing time-series representation of the measured voltage corresponding to heart function over 30 second measurement periods.

    Time frame: Up to 6 months

07

Study locations

1 site
  • University of Washington
    Seattle, Washington 98109, United States
08

References and documents

Individual participant data

Plan to share: No — The individual study data will not be shared beyond the investigative team, and only available to the sponsor in coded form. These details are outlined in the study protocol.

No publications or documents are linked to this record.

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jul 14, 2021, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT04912180
Lead sponsor
Apple Inc.
Collaborators
University of Washington
Responsible party
Sponsor
First posted
Jun 3, 2021
Start date
Apr 6, 2021
Primary completion
Jun 9, 2021
Completion
Jun 9, 2021
Last update
Jul 14, 2021

Study contacts

Helen Chu, MD, MPH
principal investigator · University of Washington

Oversight

Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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This study is terminated, as verified in Jul 2021. You cannot join it, but the record below documents what was studied.

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