The UK and some US states have set out plans for easing coronavirus lockdowns. Ultimately, any government that attempts to ease restrictions must keep a close eye on daily infection numbers and the spread of the virus. Ideally, every new case should be traced and managed.
The problem is that most countries lack the resources to test and contact-trace enough people. But our app, which is called the COVID Symptom Study and is based on some 3.4 million users in the UK, US and Sweden logging symptoms daily, could help.