from The Economist, 21 August 2021, p. 57
A 34-year-old dockworker at Ningbo, who had come into contact with visiting crews, was diagnosed with the Delta variant of covid-19 despite having received two shots of the Sinovac vaccine. On Aug. 11, China shut down operations at Ningbo which, “in the first half of this year . . . handled more tonnes of cargo than anywhere else in the world.”
“The port infection was part of an outbreak that was first discovered on July 20 at Nanjing airport. By August 10, it had spread across a dozen provinces. Unlike other countries, which are learning to live with Delta, China has imposed a hardcore combination of widespread testing and uncompromising quarantines. Anyone who tests positive is whisked to a hospital, even if they are free of symptoms. Anyone judged to have come into close contact with them (based on mobile phone data and other indicators) is quarantined, as are close contacts of these contacts. By August 10th, China had quarantined 50,808 people, more than 20 for any active confirmed case. The government has discouraged non-essential travel between cities and provinces. And two of the worst-hit cities, Nanjing and Zhengzhou, have postponed the start of the school year.
Kanlaon 
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