A worker wearing a protective suit takes a swab for a COVID-19 test at a community testing site in northern China's Tianjin Municipality, Thursday, Jan. 13, 2022. Most access to a major city adjacent to Beijing was suspended Thursday as the government tried to contain an outbreak of the coronavirus's easily transmitted omicron variant ahead of next month's Winter Olympics in the Chinese capital. (Chinatopix via AP)

Olympic Rings assembled atop of a structure stand out near a ski resort on the outskirts of Beijing, China, Thursday, Jan. 13, 2022. The Chinese capital is gearing up for the Winter Olympics the midst of COVID-19 outbreaks in several Chinese cities which have been locked down. (AP Photo/Ng Han Guan)

A worker wearing a protective suit takes a swab for a COVID-19 test at a community testing site in northern China's Tianjin Municipality, Thursday, Jan. 13, 2022. Most access to a major city adjacent to Beijing was suspended Thursday as the government tried to contain an outbreak of the coronavirus's easily transmitted omicron variant ahead of next month's Winter Olympics in the Chinese capital. (Chinatopix via AP)

FILE - In this photo released by Xinhua News Agency, a volunteer at left receives daily necessities on behalf of residents under home quarantine at the fence to a community in Yanta District of Xi'an, capital of northwest China's Shaanxi Province, Jan. 12, 2022. Just weeks before hosting the Beijing Winter Olympics, China is battling multiple coronavirus outbreaks in half a dozen cities, with the one closest to the capital driven by the highly transmissible omicron variant. (Tao Ming/Xinhua via AP, File)

Workers wearing face masks to protect against coronavirus stand inside a screening area for Winter Olympic spectators set up near the Olympic Green in Beijing, Wednesday, Jan. 12, 2022. Just weeks before hosting the Beijing Winter Olympics, China is battling multiple coronavirus outbreaks in half a dozen cities, with the one closest to the capital driven by the highly transmissible omicron variant. (AP Photo/Mark Schiefelbein)

Commuters wearing face masks to protect against coronavirus line up at a takeaway food shop in the central business district in Beijing, Thursday, Jan. 13, 2022. Just weeks before hosting the Beijing Winter Olympics, China is battling multiple coronavirus outbreaks in half a dozen cities, with the one closest to the capital driven by the highly transmissible omicron variant. (AP Photo/Mark Schiefelbein)

Commuters wearing face masks to help protect against the coronavirus walk across an intersection in the central business district in Beijing, Thursday, Jan. 13, 2022. Just weeks before hosting the Beijing Winter Olympics, China is battling multiple coronavirus outbreaks in half a dozen cities, with the one closest to the capital driven by the highly transmissible omicron variant. (AP Photo/Mark Schiefelbein)

A child wearing a face mask to help protect against the coronavirus walks out of a screening area for Winter Olympic spectators set up near the Olympic Green in Beijing, Wednesday, Jan. 12, 2022. Just weeks before hosting the Beijing Winter Olympics, China is battling multiple coronavirus outbreaks in half a dozen cities, with the one closest to the capital driven by the highly transmissible omicron variant. (AP Photo/Mark Schiefelbein)

People wearing face masks to help protect against the coronavirus look at a display of the Winter Paralympic mascot Shuey Rhon Rhon, left, and Winter Olympic mascot Bing Dwen Dwen near the Olympic Green in Beijing, Wednesday, Jan. 12, 2022. Just weeks before hosting the Beijing Winter Olympics, China is battling multiple coronavirus outbreaks in half a dozen cities, with the one closest to the capital driven by the highly transmissible omicron variant. (AP Photo/Mark Schiefelbein)

FILE - Residents line up for a second round of COVID-19 testing in northern China's Tianjin Municipality on Wednesday, Jan. 12, 2022. Just weeks before hosting the Beijing Winter Olympics, China is battling multiple coronavirus outbreaks in half a dozen cities, with the one closest to the capital driven by the highly transmissible omicron variant. (Chinatopix Via AP, File)

In this photo released by China's Xinhua News Agency, a worker wearing a protective suit swabs for a coronavirus test at a COVID-19 testing site in northern China's Tianjin Municipality, Wednesday, Jan. 12, 2022. Just weeks before hosting the Beijing Winter Olympics, China is battling multiple coronavirus outbreaks in half a dozen cities, with the one closest to the capital driven by the highly transmissible omicron variant. (Sun Fanyue/Xinhua via AP)

A woman wearing a face mask to protect against coronavirus watches as another woman poses for a photo with a statue of the Winter Olympic mascot Bing Dwen Dwen near the Olympic Green in Beijing, Wednesday, Jan. 12, 2022. The Chinese capital is on high alert ahead of the Winter Olympics as China continues to report new cases of COVID-19 in the nearby city of Tianjin. (AP Photo/Mark Schiefelbein)

Commuters wearing face masks to help protect against the coronavirus walk along a street in the central business district in Beijing, Thursday, Jan. 13, 2022. Just weeks before hosting the Beijing Winter Olympics, China is battling multiple coronavirus outbreaks in half a dozen cities, with the one closest to the capital driven by the highly transmissible omicron variant. (AP Photo/Mark Schiefelbein)