An app tracking people's coronavirus symptoms suggests more than 6.6 million Brits could have already contracted the infection.
The COVID Symptom Tracker, which was created by scientists at King's College London, has had more than 1.25 million people download it since it launched on Tuesday.
It's now the third most popular download in the UK's App Store, with some 50,000 new users every hour. It takes the person's basic personal information before asking them specific questions about coronavirus symptoms, such as if they have a cough, a high temperature, fatigue or are struggling to breathe.
It also asks whether they have certain underlying health conditions such as asthma. Analysis of the first 650,000 users found that 10% of them have