A medical stafferperforms an acid nucleic testing on an inbound traveler on March 21, 2020. [Photo by Gao Erqiang/chinadaily.com.cn]

After receiving customs checks and epidemiological investigations by the local centers of disease control and prevention at the airports, travelers will be transported to designated venues scattered in Shanghai's 16 districts to undergo nucleic acid testing.

"As it takes six to eight hours before the test result is obtained, we provide them with simple meals, biscuits, bottled water, and deck chairs. Elderly travelers and those having babies and young children will be arranged in a separate room to rest," said Ji Guanzhong, a worker at a testing venue near Shanghai Hongqiao International Airport.