Residents line up for mass coronavirus tests in Huaxian County in central China's Henan Province, Friday, Jan. 14, 2022. China further tightened its anti-pandemic measures in Beijing and across the country on Friday as scattered outbreaks continued ahead of the opening of the Winter Olympics in a little over two weeks. (Chinatopix via AP)

A medical worker wearing a protective suit swabs a child for a coronavirus test in Huaxian County in central China's Henan Province, Friday, Jan. 14, 2022. China further tightened its anti-pandemic measures in Beijing and across the country on Friday as scattered outbreaks continued ahead of the opening of the Winter Olympics in a little over two weeks. (Chinatopix via AP)

A medical worker wearing a protective suit swabs a child for a coronavirus test in Huaxian County in central China's Henan Province, Friday, Jan. 14, 2022. China further tightened its anti-pandemic measures in Beijing and across the country on Friday as scattered outbreaks continued ahead of the opening of the Winter Olympics in a little over two weeks. (Chinatopix via AP)

Medical workers wearing protective suits take swabs for coronavirus tests in a neighborhood in Xi'an in northwestern China's Shaanxi Province, Friday, Jan. 14, 2022. China further tightened its anti-pandemic measures in Beijing and across the country on Friday as scattered outbreaks continued ahead of the opening of the Winter Olympics in a little over two weeks. (Chinatopix via AP)

A medical worker wearing a protective suit swabs a resident for a coronavirus test in Huaxian County in central China's Henan Province, Friday, Jan. 14, 2022. China further tightened its anti-pandemic measures in Beijing and across the country on Friday as scattered outbreaks continued ahead of the opening of the Winter Olympics in a little over two weeks. (Chinatopix via AP)

Residents line up for mass coronavirus tests in Huaxian County in central China's Henan Province, Friday, Jan. 14, 2022. China further tightened its anti-pandemic measures in Beijing and across the country on Friday as scattered outbreaks continued ahead of the opening of the Winter Olympics in a little over two weeks. (Chinatopix via AP)