Thousands of contact tracers are making their first phone calls to track down people who will be told to self-isolate under new test and trace schemes being launched in England and Scotland.
Tracers will text, email or call people who test positive with coronavirus and ask who they have had contact with.
Any of those contacts deemed at risk of infection will be told to isolate for 14 days, even if they are not sick.
Those who have already had the virus will also be asked to self-isolate.
The aim of the system is to lift blanket lockdown restrictions and move towards more localised, targeted measures.
Health Secretary Matt Hancock said he was confident that the “vast majority of people” would participate in the voluntary system.
“In this war on the virus, ultimately we are all on the same side and we’ve all got a part that we can play,” he said.
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The 25,000 tracers working for England’s NHS Test and Trace team started by contacting the 2,013 people who tested positive for the virus on Wednesday.