Self-report daily.
Help slow the outbreak.
Identify those at risk sooner.

From physicians & researchers at

  • Harvard T.H. Chan School of Public Health
  • Massachusetts General Hospital
  • King's College London
  • Stanford University School of Medicine
  • ZOE

Millions of people are now supporting our scientists to help the health services across the world.

Your participation can provide new insight into COVID, help identify those at risk sooner and support the health workers who are risking their own health to help us.

Tim Spector, MD FRCP FRSB, lead researcher

Professor of Genetic Epidemiology at King’s College London and Director of TwinsUK

If enough people participate in sharing their symptoms, this app can provide the healthcare system with critically valuable information.

This app-based study is a way to find out where the COVID hot spots are, new symptoms to look out for, and might be used as a planning tool to target quarantines, send ventilators and provide real-time data to plan for future outbreaks.

Andrew Chan, MD, MPH, lead researcher

Professor of Medicine, Harvard Medical School
Professor of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health
Chief of the Clinical and Translational Epidemiology Unit, CTEU Massachusetts General Hospital


Take 1-minute to self-report daily, even if you are well.

Help our scientists identify:

  • High-risk areas
  • Who is most at risk, by better understanding symptoms linked to underlying health conditions
  • How fast the virus is spreading in your area

COVID Symptom Tracker in the press

About this research

The COVID symptom tracker was created by doctors and scientists at the Harvard T.H. Chan School of Public Health, Massachusetts General Hospital, King's College London and Stanford University School of Medicine, working in partnership with ZOE Global Ltd – a health science company.

This app was built in the US to support the Nurses’ Health Study. This is one of the largest and longest-running scientific studies in the world with 280,000 participants stretching back to 1976. Many participants in the Nurses' Health Study are still active healthcare workers who are treating people with COVID across the country and risking their own health to help us. The app is now available to anyone in the US or UK who wants to help.

The app will be used to study the symptoms of COVID-19 and track the spread of this virus. This research is led by Prof. Tim Spector, professor of genetic epidemiology at King’s College London and director of TwinsUK; Prof. Andrew Chan, professor of Medicine at Harvard Medical School, and Chief of Clinical and Translational Epidemiology Unit at Massachusetts General Hospital; and Prof. Christopher Gardner, Rehnborg Farquhar Professor of Medicine at Stanford University Prevention Research Center.

Prof. Spector created and runs TwinsUK, which is a scientific study of 15,000 identical and non-identical twins that has been running for nearly three decades. As well as using the app to study symptoms in the general population, TwinsUK is using it to understand how symptoms develop with participating twins. Their research is funded by the Wellcome Trust and the National Institute for Health Research.

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Collaborating on the science

If you're doing research on COVID-19 and you want to contribute or believe this initiative can help your efforts, please let us know at [email protected]

Please contact us only if you're a public health organization, government, academic, scientific, research or health institution or charity.