On Friday, Chinese health authorities began testing every single resident of Zhengzhou, the capital of China’s central Henan Province, after a handful of COVID-19 cases were detected in the massive city of 12.5 million. Just six hours later, they were finished, achieving a rate of 2.1 million people tested per hour, or 583 residents per second, according to the Global Times.
For comparison, that is equal to New York City and Chicago combined. On Sunday, health officials set about trying to do it again with the even larger city of Tianjin, home to 14 million people.
China’s National Health Commission reported a total of 157 new cases in all of mainland China on Sunday, 97 of which were domestically transmitted. Of those 97, 60 were in Henan, including 24 in Zhengzhou, and 21 cases in Tianjin, a port city southeast of Beijing. The city also said over the weekend that it had detected two cases of Omicron.