Passengers go through entry procedures at Shanghai Pudong International Airport in east China's Shanghai, Jan. 8, 2023. From Sunday, China starts managing COVID-19 with measures designed for combating Class B infectious diseases, instead of Class A infectious diseases. (Xinhua/Ding Ting)

Inbound passengers arrive at Shanghai Pudong International Airport in east China's Shanghai, Jan. 8, 2023. From Sunday, China starts managing COVID-19 with measures designed for combating Class B infectious diseases, instead of Class A infectious diseases. (Xinhua/Ding Ting)

A staff member of the customs of Shanghai Pudong International Airport checks the information of an inbound passenger in east China's Shanghai, Jan. 8, 2023. From Sunday, China starts managing COVID-19 with measures designed for combating Class B infectious diseases, instead of Class A infectious diseases. (Xinhua/Ding Ting)

Passengers queue up to go through entry procedures at Shanghai Pudong International Airport in east China's Shanghai, Jan. 8, 2023. From Sunday, China starts managing COVID-19 with measures designed for combating Class B infectious diseases, instead of Class A infectious diseases. (Xinhua/Ding Ting)

Passengers queue up to go through entry procedures at Shanghai Pudong International Airport in east China's Shanghai, Jan. 8, 2023. From Sunday, China starts managing COVID-19 with measures designed for combating Class B infectious diseases, instead of Class A infectious diseases. (Xinhua/Ding Ting)

Inbound passengers arrive at Shanghai Pudong International Airport in east China's Shanghai, Jan. 8, 2023. From Sunday, China starts managing COVID-19 with measures designed for combating Class B infectious diseases, instead of Class A infectious diseases. (Xinhua/Ding Ting)