Self-isolation for contacts of people with confirmed coronavirus will be shortened from 14 to 10 days across the UK from Monday.
The change will also apply to people instructed to quarantine after returning from high-risk countries.
And it means anyone who has been self-isolating for 10 days or more will be able to end their quarantine on Monday.
A statement from the four UK chief medical officers said:
“Self-isolation is essential to reducing the spread of COVID as it breaks the chains of transmission,”
“After reviewing the evidence, we are now confident that we can reduce the number of days that contacts self-isolate from 14 days to 10 days.
“People who return from countries which are not on the travel corridor list should also self-isolate for 10 days instead of 14 days.
“People who test positive should continue to self-isolate for 10 days from onset of symptoms or 10 days from point of taking a positive test if asymptomatic.”
“We urge everyone to self-isolate when appropriate, it will save lives.”
NHS Test and Trace will tell people to self-isolate for 10 days from Monday, but due to the time taken to develop technical changes, the NHS COVID-19 app will only do the same from Thursday.