All businesses except those that supply food, fuel and other necessities were ordered to close or work from home.

Beijing, March 13, 2022 — China’s government responded Sunday to a spike in coronavirus infections by shutting down its southern business center of Shenzhen, a city of 17.5 million people, and restricted access to Shanghai by suspending bus service.

Everyone in Shenzhen, a finance and technology center that abuts Hong Kong, will undergo three rounds of testing after 60 new cases were reported Sunday. All businesses except those that supply food, fuel and other necessities were ordered to close or work from home.

Case numbers in China’s latest infection surge are low compared with other countries and with Hong Kong, which reported more than 32,000 on Sunday. But mainland authorities are enforcing a “zero tolerance” strategy and have locked down entire cities to find and isolate every infected person.

Shenzhen is home to some of China’s most prominent companies, including telecom equipment maker Huawei Technologies Ltd., electric car brand BYD Auto, Ping An Insurance Co. and Tencent Holding, operator of the popular WeChat message service.