Babbage: Can the curve be flattened?

Dramatic measures to staunch the spread of covid-19 are happening around the world, but will they be enough to reduce the rate of new cases? And amid public anxiety we answer your questions such as can you get coronavirus twice? How does testing work? And how long does the virus live on surfaces and in the air? The Economist’s health-care and science correspondents answer your covid-19 questions. Kenneth Cukier hosts

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