Support WBURWhy China's 'zero COVID' policy is finally falteringPlay04:01Download AudioMichaeleen DoucleffSteve InskeepNovember 30, 2022 ShareChina is doing many millions of tests a day to uncover cases of COVID-19 — part of its zero-COVID policy. Above: People line up for nucleic acid tests to detect the virus at a public testing site on Nov. 17 in Beijing. (Kevin Frayer/Getty Images)