Coronavirus Live News: Global Updates

Coronavirus Live News: Global Updates

Britain will start mass testing and contact tracing, but other countries are way ahead.

As the British government prepares to rolls out a large-scale track and trace system designed to prevent a second major wave of infections, other countries’ experiences offer case studies — and cautionary tales.

Starting on Thursday, anyone in Britain who suffers potential symptoms of Covid-19 will be tested and, if positive, be asked to list everyone with whom they have recently been in close contact for at least 15 minutes. Those people, in turn, will be contacted and asked to isolate themselves for 14 days.

Britain’s program is the latest in similar campaigns around the world that serve as tests of how testing and contact tracing affect transmission of the virus. The results so far are mixed.

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