A man wearing face mask to help curb the spread of the coronavirus walks along the streets of Hong Kong, Thursday, March 31, 2022. (Photo by Vincent Yu/AP Photo)





Sanitation workers wearing personal protective equipment (PPE) conduct disinfection work at The Bund on March 31, 2022 in Shanghai, China. (Photo by Yang Jianzheng/VCG via Getty Images)





The Jinshanling Great Wall is seen after a rainfall on March 31, 2022 in Chengde, Hebei Province of China. (Photo by Zhou Wanping/VCG via Getty Images)





Workers and volunteers look on in a compound where residents are tested for the Covid-19 coronavirus during the second stage of a pandemic lockdown in Jing' an district in Shanghai on April 1, 2022. (Photo by Hector Retamal/AFP Photo)





A police officer in a protective suit keeps watch on a street, as the second stage of a two-stage lockdown to curb the spread of the coronavirus disease (COVID-19) begins in Shanghai, China on April 1, 2022. (Photo by Aly Song/Reuters)





Residents line up for the first round of mass COVID testing in the Jingan district of western Shanghai, China, Friday, April 1, 2022. As residents of western Shanghai start a four day lockdown for mass testing, some in eastern Shanghai about to end their lock down are being told they will be confined to their homes for at least 10 more days. It was the latest wrinkle in the lockdown of China's largest city as it struggles to eliminate an omicron-driven coronavirus outbreak under China's zero-COVID policy. (Photo by Chen Si/AP Photo)





A police officer in protective gear watches over residents lining up for COVID tests in the Jingan district of western Shanghai, China, Friday, April 1, 2022. (Photo by Chen Si/AP Photo)





Workers wearing gowns, masks and gloves, direct arriving passengers from Manila for buses to quarantine hotels in Hong Kong international airport, Friday, April 1, 2022. The first flight to arrive in Hong Kong after authorities lifted a COVID ban on arrivals from nine countries including Australia, Canada, France, India, Nepal, Pakistan, the Philippines, the UK and the US. (Photo by Kin Cheung/AP Photo)





Residents wearing face masks to help protect from the coronavirus bring their children for sunbathing outside a mall, Sunday, April 3, 2022, in Beijing. COVID-19 cases in China's largest city of Shanghai are still rising as millions remain isolated at home under a sweeping lockdown. (Photo by Andy Wong/AP Photo)





Workers deliver packages of coronavirus prevention materials to people during an anti-epidemic event in Hong Kong, Saturday, April 2, 2022. Hong Kong authorities on Saturday asked the entire population of more than 7.4 million people to voluntarily test themselves for COVID-19 at home for three days in a row starting next week. (Photo by Kin Cheung/AP Photo)





People wearing traditional Chinese costumes participate in Qingming Festival celebrations on April 2, 2022 in Wuhan, Hubei province, China. The Qingming festival or Tomb-Sweeping Day, held on April 5 this year, is an annual Chinese ethnic ritual to remember, honour, and pilgrimage to ancestors' graves, and is celebrated across ethnic Chinese communities. (Photo by Getty Images)





A person in personal protective equipment (PPE) walks a dog at a resident community, as the second stage of a two-stage lockdown has been launched to curb the spread of the coronavirus disease (COVID-19) in Shanghai, China on April 3, 2022. (Photo by Aly Song/Reuters)





Residents line up for mass testing in a lockdown area in the Jingan district of western Shanghai, Monday, April 4, 2022. China has sent more than 10,000 health workers from across the country to Shanghai, including 2,000 military medical staff, as it struggles to stamp out a rapidly spreading COVID-19 outbreak in China's largest city. (Photo by Chen Si/AP Photo)





A worker in protective gear holds a sign which reads “Keep one meter apart” along an empty street in a lockdown area in the Jingan district of western Shanghai, Monday, April 4, 2022. (Photo by Chen Si/AP Photo)





Residents stand along a street during a mass testing day in a lockdown area in the Jingan district of western Shanghai, Monday, April 4, 2022. (Photo by Chen Si/AP Photo)





Residents line up for nucleic acid testing at a residential area, during the second stage of a two-stage lockdown to curb the spread of the coronavirus disease (COVID-19), in Shanghai, China on April 4, 2022. (Photo by Aly Song/Reuters)





Girls in Han costumes pose for a photo with blooming cherry blossoms at Yuyuantan Park during Qingming Festival holiday on April 4, 2022 in Beijing, China. Qingming Festival, also known as Tomb Sweeping Day, falls on April 5 this year. (Photo by Zhao Naiming/VCG via Getty Images)





This aerial photo shows lines of graves at the Chinese Christian Cemetery on the western side of Hong Kong Island on April 5, 2022 as people visit cemeteries to honour their ancestors during the annual Tomb Sweeping Day, known locally in Hong Kong as Ching Ming. (Photo by Peter Parks/AFP Photo)





A man wearing face mask burns paper money at the gravesite of a relative in a cemetery during the Chinese Ching Ming, or Tomb Sweeping Day, in Hong Kong Tuesday, April 5, 2022. Thousands of Hong Kong residents pay respects to their ancestors and relatives during the annual festival. (Photo by Vincent Yu/AP Photo)





A woman pulls up her mask to get her throat swab at a coronavirus testing site near residential buildings, Wednesday, April 6, 2022, in Beijing. (Photo by Andy Wong/AP Photo)