The answer is quick and strong, to say the least.
Shenzhen Airport in southern China canceled hundreds of flights on Saturday and tightened controls after a restaurant worker tested positive for the Delta variant of Covid-19.
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To enter the airport, one must present a negative test within 48 hours, the Shenzhen Airport Group said in a statement on its official account on the social network WeChat.
These restrictions came into effect at 1:00 p.m. local time (05:00 GMT).
A 21-year-old waitress at Shenzhen Baoan International Airport was infected with the delta variant, city health officials said.
She tested positive in a routine test performed on airport workers on Thursday.
Shenzhen, a city on the mainland and neighboring Hong Kong, is home to big Asian tech companies like Huawei and Tencent.
China reported 30 new cases of coronavirus on Friday, including six in Guangdong province (south) where Shenzhen is located.
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Nearly 400 flights were canceled on Friday, according to the VariFlight website.
Dozens of flights scheduled for Saturday were also canceled.
Passages will be fully refunded, according to airport authorities.
Millions of Shenzhen residents have been tested in recent weeks after a small outbreak was detected in the port this month.
