Workers wearing face masks to help protect from the coronavirus set up a decoration for the Winter Olympic Games in Beijing, Sunday, Jan. 16, 2022. Beijing has reported its first local omicron infection, according to state media, weeks before the Winter Olympic Games are due to start. (AP Photo/Andy Wong)

In this photo released by Xinhua News Agency, residents wearing face masks to protect from the coronavirus shop for groceries at a supermarket in Qujiang New District of Xi'an in northwestern China's Shaanxi Province on Jan. 15, 2022. The Chinese city of Xi'an has gradually begun lifting restrictions after over three weeks of lockdown as authorities sought to stamp out a local outbreak before the Beijing Winter Olympic Games are due to start. (Tao Ming/Xinhua via AP)

CORRECTS TO SWAB, NOT NASAL SWAB - Security guards set up the barricade line as people line up to get a swab for the COVID-19 test to meet traveling requirements at a mobile coronavirus testing facility outside a commercial office buildings in Beijing, Sunday, Jan. 16, 2022. Beijing has reported its first local omicron infection, according to state media, weeks before the Winter Olympic Games are due to start. (AP Photo/Andy Wong)

CORRECTS TO SWAB, NOT NASAL SWAB - A People line up to get a swab for the COVID-19 test to meet traveling requirements at a mobile coronavirus testing facility outside a commercial office buildings in Beijing, Sunday, Jan. 16, 2022. Beijing has reported its first local omicron infection, according to state media, weeks before the Winter Olympic Games are due to start. (AP Photo/Andy Wong)

In this photo released by Xinhua News Agency, residents wearing face masks to protect from the coronavirus shop for groceries at a supermarket in Qujiang New District of Xi'an in northwestern China's Shaanxi Province on Jan. 15, 2022. The Chinese city of Xi'an has gradually begun lifting restrictions after over three weeks of lockdown as authorities sought to stamp out a local outbreak before the Beijing Winter Olympic Games are due to start. (Tao Ming/Xinhua via AP)

CORRECTS TO SWAB, NOT NASAL SWAB - A man gets a swab for the COVID-19 test to meet traveling requirements at a mobile coronavirus testing facility outside a commercial office buildings in Beijing, Sunday, Jan. 16, 2022. Beijing has reported its first local omicron infection, according to state media, weeks before the Winter Olympic Games are due to start. (AP Photo/Andy Wong)

Workers wearing face masks to help protect from the coronavirus set up a decoration for the Winter Olympic Games in Beijing, Sunday, Jan. 16, 2022. Beijing has reported its first local omicron infection, according to state media, weeks before the Winter Olympic Games are due to start. (AP Photo/Andy Wong)

FILE - A woman wearing a face mask to protect against COVID-19 walks past a clock counting down the time until the opening ceremony of the 2022 Winter Olympics in Beijing, Saturday, Jan. 15, 2022. Beijing has reported its first local omicron infection, according to state media, weeks before the Olympic Winter Games is due to start. (AP Photo/Mark Schiefelbein, File)

In this Jan. 13, 2022 photo released by Xinhua News Agency, a woman and a child perform exercise on a rooftop at a residential area in Xi'an in northwestern China's Shaanxi Province. The Chinese city of Xi'an has gradually begun lifting restrictions after over three weeks of lockdown as authorities sought to stamp out a local outbreak before the Beijing Winter Olympic Games are due to start. (Tao Ming/Xinhua via AP)