Volunteers wearing face masks to help protect from the coronavirus check name lists at a coronavirus testing facility at a school in Fengtai District in Beijing, Monday, Jan. 24, 2022. Chinese authorities have lifted a monthlong lockdown of Xi'an and its 13 million residents as infections subside ahead of the Winter Olympics. Meanwhile, the 2 million residents of one Beijing district are being tested following a series of cases in the capital. (AP Photo/Andy Wong)

Volunteers help women enter information on their smartphones as others gather in line for mass coronavirus testing in Beijing, Monday, Jan. 24, 2022. Chinese authorities have lifted a monthlong lockdown of Xi'an and its 13 million residents as infections subside ahead of the Winter Olympics. Meanwhile, the 2 million residents of one Beijing district are being tested following a series of cases in the capital. (AP Photo/Andy Wong)

People wearing face masks to help protect from the coronavirus cross an intersection in Fengtai District in Beijing, Monday, Jan. 24, 2022. Chinese authorities have lifted a monthlong lockdown of Xi'an and its 13 million residents as infections subside ahead of the Winter Olympics. Meanwhile, the 2 million residents of one Beijing district are being tested following a series of cases in the capital. (AP Photo/Andy Wong)

Samples are taken from people at a mass coronavirus testing site in Beijing, Monday, Jan. 24, 2022. Chinese authorities have lifted a monthlong lockdown of Xi'an and its 13 million residents as infections subside ahead of the Winter Olympics. Meanwhile, the 2 million residents of one Beijing district are being tested following a series of cases in the capital. (AP Photo/Andy Wong)

Pedestrians wearing face masks to help protect from the coronavirus wait to cross an intersection in the Central Business District of Beijing, Monday, Jan. 24, 2022. A fresh outbreak in Beijing has prompted authorities to test millions and impose new measures two weeks ahead of the opening of the Winter Olympics, even as Chinese officials on Monday lifted a monthlong lockdown on the northern city of Xi'an and its 13 million residents. (AP Photo/Andy Wong)

Medical workers prepare for work at a mass coronavirus testing site in Beijing, Monday, Jan. 24, 2022. Chinese authorities have lifted a monthlong lockdown of Xi'an and its 13 million residents as infections subside ahead of the Winter Olympics. Meanwhile, the 2 million residents of one Beijing district are being tested following a series of cases in the capital. (AP Photo/Andy Wong)

Residents wearing face masks to protect from the coronavirus line up for the coronavirus testing at a school in Fengtai District in Beijing, Monday, Jan. 24, 2022. Chinese authorities have lifted a monthlong lockdown of Xi'an and its 13 million residents as infections subside ahead of the Winter Olympics. Meanwhile, the 2 million residents of one Beijing district are being tested following a series of cases in the capital. (AP Photo/Andy Wong)

A volunteer wearing a face mask to help protect from the coronavirus checks the name list as residents line up during a mass coronavirus testing at a school in Fengtai District in Beijing, Monday, Jan. 24, 2022. Chinese authorities have lifted a monthlong lockdown of Xi'an and its 13 million residents as infections subside ahead of the Winter Olympics. Meanwhile, the 2 million residents of one Beijing district are being tested following a series of cases in the capital. (AP Photo/Andy Wong)

A woman get a throat swab at a mass coronavirus testing site in Beijing, Monday, Jan. 24, 2022. Chinese authorities have lifted a monthlong lockdown of Xi'an and its 13 million residents as infections subside ahead of the Winter Olympics. Meanwhile, the 2 million residents of one Beijing district are being tested following a series of cases in the capital. (AP Photo/Andy Wong)

In this photo released by Xinhua News Agency, staff members wearing face masks hold giant panda cubs as they make a group appearance at the Shenshuping base of China Conservation and Research Center for Giant Pandas in Wolong in southwestern China's Sichuan Province, Monday, Jan. 24, 2022. Giant panda cubs born in 2021 were brought out on Monday for an event to mark the upcoming Lunar New Year. (Wang Xi/Xinhua via AP)

Security personnel stand watch as masked people gather in line for coronavirus testing in Beijing, Monday, Jan. 24, 2022. Chinese authorities have lifted a monthlong lockdown of Xi'an and its 13 million residents as infections subside ahead of the Winter Olympics. Meanwhile, the 2 million residents of one Beijing district are being tested following a series of cases in the capital. (AP Photo/Andy Wong)