Coronavirus: The numbers

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A lot has changed since our last episode covering the numbers behind the coronavirus - for a start it now has a name, Covid-19. This week news has broken that deaths are 20 per cent higher than thought, and the number of cases has increased by a third. Tim Harford talks to Dr Nathalie MacDermott, a clinical lecturer at King’s College London about what we know – and what we still don’t. Presenter: Tim Harford Producer: Anna Meisel (A boy wears makeshift protection at Shanghai railway station on February 13, 2020. Credit: Noel Celis / Getty images)