Covid: What is mass testing and how does it work?
Mass testing is set to be introduced in all England's tier three “high risk” coronavirus areas, following a pilot in Liverpool.
Students will also be tested before they return home for Christmas.
How does mass testing work and what does it achieve?
What is mass testing and why is it important?
Mass testing means asking everyone to be tested, whether or not they have symptoms.
The idea is to find healthy people who may be infected, but not yet displaying symptoms. They can then be told to isolate and be prevented from spreading the virus.
Currently, across most of England, people can only have a test if they already have symptoms. But during the Liverpool pilot, everyone living or working in the city is being offered a voluntary test.
Under the new tier system, which is set to come in after lockdown, mass testing is likely to become more widespread in England's tier three areas.
Where is mass testing available?
Mobile testing sites have been set up across Liverpool, in places like care homes, schools, universities and workplaces.
People might be invited by their local authority to come for a test but they can also book their own online, or whole families can just turn up in their car.
About 2,000 military personnel are helping with logistics and delivering the tests across a potential 85 sites.
More than 23,000 people have been tested in Liverpool since the pilot began, with 154 people receiving positive results. The city has a population of about half a million.
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