Coronavirus: Do lockdowns work - and what happens when they're lifted?

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Countries around the world have followed China's example in imposing lockdowns. Do they work in slowing down an epidemic - and what happens when countries are opened up again? Professor David Heymann, an infectious disease epidemiologist who headed the WHO’s global response to SARS, explains the strategy. Photo: A deserted street in Barcelona, Spain, after the lockdown was imposed on the country Credit: Getty Images