Residents queue for a Covid-19 test in the Hongkou district of Shanghai, China, on June 11. Bloomberg News China’s biggest cities are doubling down on Covid-19 testing in a bid to stamp out persistent infections, as the US ambassador to the country warns the zero-tolerance approach is likely to last beyond this year and actively chill foreign investment. In Beijing, workers in key sectors including schools, hospitals and supermarkets, as well as delivery drivers and even people who live near airports with inbound flights will need to be tested more often, the local government said at a briefing Thursday. Shanghai this week announced plans to test the entire city every weekend until the end of July to stamp out the virus. Residential complexes where infections are found will be temporarily locked down. The mass-testing drives come even as cases in China remain low in comparison to the rest of […]