A team of 25,000 contact tracers will make their first phone calls within hours – to track down people who will be told to self-isolate under the new test and trace scheme in England.
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.
The prime minister said the system will “change people’s lives”.
The aim of the NHS Test and Trace system is to lift national lockdown restrictions and move towards more localised, targeted measures.
The contacts of people who tested positive on Wednesday will be the first to be chased by the NHS Test