大象传媒

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鈥檚 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