A massive system to find people who come into close contact with those infected with coronavirus will start in England on Thursday, UK Prime Minister Boris Johnson has said.However, scientists have warned it is not a "magic bullet" and may prevent between 5% and 15% of infections.
Northern Ireland has its own version up and running, Scotland has announced its own system will start on Thursday and Wales' system is due to start in early June, BBC reported.
What will I have to do now?
As is currently the case, anyone who develops symptoms of coronavirus - a persistent cough, fever or a sudden loss of taste or sense of smell - will have to isolate for seven days and the rest of their household for 14 days.
The difference is that from Thursday, everyone with symptoms should ask for a test online or call to arrange a test by calling 119.
If the test comes back negative, everyone in your household can go back to normal.But if the test comes back positive, the NHS Test and Trace team will get in touch - via text, email or phone call - to discuss whom you have come into close contact with.
What is a close contact?
Close contacts are:
1. People you spend 15 minutes or more with at a distance of less than 2m
2. People you have direct contact with - such as sexual partners, household members or people with whom you have had face-to-face conversations at a distance of less than 1m
3. The contact must have taken place between two days before and up to seven days after symptoms appeared.