UK Health secretary Matt Hancock says it's people's 'civic duty' to co-operate with a new coronavirus test and trace regime being rolled out (on Thursday).
The NHS system is going live with 25-thousand contact tracers recruited.
Their job will be to trace everyone who's come close to a Covid-19 sufferer - and tell them to self-isolate for 14-days, even if they have no symptoms.
Public health professor Linda Bauld explains what that means.
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