China's 'Silicon Valley' Tightens Rules Over Covid Flare-up

China's biggest tech hub is rushing to stamp out a fresh Covid outbreak, ordering some of the country's biggest manufacturers to operate in a'closed loop' to reduce infections, state media reported. The city of Shenzhen, which borders Hong Kong, reported just 19 Covid cases Tuesday as the city's health authority said the risk of "large-scale spread is low". But Beijing's reluctance to budge from its strict zero-Covid policy had led to daily mass testing for the 13 million residents of Shenzhen for over a week and the closure of at least three subway stations by Tuesday. Top manufacturers including iPhone maker Foxconn, electric carmaker BYD, drone maker DJI and telecom equipment maker ZTE are among the companies told to operate under a "closed-loop" production system. It would restrict movement of employees for seven days, state-run business news site Yicai reported Monday.