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COVID-19 Symptom Tracker

COVID-19 Symptom Tracker

Status
Active, not recruiting
Phases
Unknown
Study type
Observational
Source
ClinicalTrials.gov
Registry ID
NCT04331509
Enrollment
10000000
Registered
2020-04-02
Start date
2020-03-23
Completion date
2026-03-23
Last updated
2025-03-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

COVID-19

Keywords

COVID-19, Coronovirus, Symptom tracker, Virus, Pandemic

Brief summary

The viral Covid-19 outbreak is now considered a pandemic according to the World Health Organisation (WHO). A free monitoring app 'COVID-19 Symptom Tracker' has been developed to record and monitor the symptoms of the COVID-19 coronavirus infection; tracking in real time how the disease progresses. The app also records how measures aimed at controlling the pandemic including self-isolation and distancing are affecting the mental health and well-being of participants. The data from the study will reveal important information about the symptoms and progress of COVID-19 infection in different people, and why some go on to develop more severe or fatal disease while others have only mild symptoms do not.

Detailed description

A free monitoring app 'COVID-19 Symptom Tracker' has been developed by health technology company Zoe Global Limited in collaboration with scientists at King's College London, Harvard Medical School, Massachusetts General Hospital and Stanford University. A web-based equivalent is being developed for those unable to download this app. This new app records and monitors the symptoms of COVID-19 coronavirus infection; tracking in real time how the disease progresses. The app also records how measures aimed at controlling the pandemic including self-isolation and distancing affect the mental health and well-being of participants. The app also allows self-reporting where no symptoms are experienced such that it records any users that feel healthy and normal. The app, has been launched in both the UK and the US. Researchers in other countries are encouraged to obtain the required approvals from Apple and Google to make the app available in their territories. The data from the study will reveal important information about the symptoms and progress of COVID-19 infection in different people, and why some go on to develop more severe or fatal disease while others have only mild symptoms do not. It is also hoped that the data generated from this study will help the urgent clinical need to distinguish mild coronavirus symptoms from seasonal coughs and colds, which may be leading people to unnecessarily self-isolate when they aren't infected or inadvertently go out and spread the disease when they are. Users download the free app COVID-19 Symptom Tracker and record information about their health on a daily basis, including temperature, tiredness and symptoms such as coughing, breathing problems or headaches. The app is available internationally to the general population and will also be used in two large epidemiological cohorts: The TwinsUK cohort (n=15,000) and Nurses Health Study (n=280,000). The app will allow scientists to study the spread and development of symptoms across whole populations, both in the UK and abroad, as well as detailed genetic and other studies, particularly with the twins cohort Any data gathered from the app and study will be used strictly for public health or academic research and will not be used commercially or sold.

Interventions

OTHERNo Intervention

No Intervention

Sponsors

Zoe Global Limited
CollaboratorOTHER
Massachusetts General Hospital
CollaboratorOTHER
Harvard School of Public Health (HSPH)
CollaboratorOTHER
Stanford University
CollaboratorOTHER
King's College London
Lead SponsorOTHER

Study design

Observational model
COHORT
Time perspective
PROSPECTIVE

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes

Inclusion criteria

* Adults of 18 years and above, both in the UK and internationally where the app has been approved for download from the Apple App store and Google Play. The web-based equivalent to the app will also be made available via a link for those unable to download.

Exclusion criteria

* Anyone below the age of 18; anyone unable to provide informed consent.

Design outcomes

Primary

MeasureTime frameDescription
Physical health symptoms1 daySelf reported as physically healthy (tick box)
Lack of physical health symptoms1 daySelf reported as physically not feeling healthy (tick box)

Secondary

MeasureTime frameDescription
Fever1 daySelf reported remperature (Degrees Celsius)

Other

MeasureTime frameDescription
Shortness of breath1 daySelf reported shortness of breath (drop down menu; yes/no)
Sore throat1 daySelf reported sore throat (drop down menu; yes/no)
Loss of smell/ taste1 daySelf reported loss of smell/ taste (drop down menu; yes/no)
Hoarse voice1 daySelf reported hoarse voice (drop down menu; yes/no)
Cough1 daySelf reported cough (drop down menu; yes/no)
Abdominal pain1 daySelf reported abdominal pain (drop down menu; yes/no)
Diarrhoea1 daySelf reported diarrhoea (drop down menu; yes/no)
Confusion1 daySelf reported confusion (drop down menu; yes/no)
Skipping meals1 daySelf reported skipping meals (drop down menu; yes/no)
Chest pain or tightness1 daySelf reported chest pain or tightness (drop down menu; yes/no)
Fatigue1 daySelf reported fatigue (drop down menu; yes/no)
Headache1 daySelf reported headache (drop down menu; yes/no)

Countries

United Kingdom, United States

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 26, 2026