BEIJING — 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 the Chinese territory of 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.Download the NBC News app for breaking news and politics Shenzhen is home to some of China’s most prominent companies, including telecom equipment maker Huawei Technologies, electric car brand BYD Auto, Ping An Insurance and Tencent Holding, operator of the popular WeChat message service.On the mainland, the government reported 1,938 new cases, more than triple Saturday’s total.About three-quarters, or 1,412 cases, were in Jilin province in the northeast, where the industrial metropolis of Changchun

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