Who should be quarantined?

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Some countries are requiring new arrivals to self-isolate, a policy designed to stop infection spreading from areas of high prevalence to low prevalence. Tim Harford and Ruth Alexander find out which countries have the highest rate of Covid-19 infection. Plus, is it really true that the coronavirus mostly kills people who would die soon anyway? Presenter: Tim Harford Producers: Ruth Alexander and Kate Lamble (Passengers wearing PPE arrive at Heathrow airport in London UK. Credit: Tolga Akmen/Getty Images)