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Shanghai seeks ‘societal zero COVID’ with rounds of testing

A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) A hostess wearing a face mask waits for customers at the entrance of a restaurant in Beijing, Wednesday, April 27, 2022. China's capital city Beijing is in the middle of mass testing millions of residents after cases were discovered over the weekend. The city reported over 30 new cases Wednesday, several of which were asymptomatic. (AP Photo/Mark Schiefelbein) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, staff members on their way to conduct nucleic test for residents recently released from makeshift hospital in the Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) In this photo released by Xinhua News Agency, a worker takes a swab sample from a resident for nucleic acid test in Huangpu District in Shanghai, China, on Tuesday, April 26, 2022. (Li He/Xinhua via AP) Residents line up in the rain for COVID test on Wednesday, April 27, 2022, in Beijing. Workers put up fencing and police restricted who could leave a locked-down area in Beijing on Tuesday as authorities in the Chinese capital stepped up efforts to prevent a major COVID-19 outbreak like the one that has all but shut down the city of Shanghai. (AP Photo/Ng Han Guan) Residents line up in the rain for COVID test on Wednesday, April 27, 2022, in Beijing. Workers put up fencing and police restricted who could leave a locked-down area in Beijing on Tuesday as authorities in the Chinese capital stepped up efforts to prevent a major COVID-19 outbreak like the one that has all but shut down the city of Shanghai. (AP Photo/Ng Han Guan) A worker reminds residents to wear their masks and keep their distance as they line up for COVID test on Wednesday, April 27, 2022, in Beijing. Shanghai city authorities said Wednesday they will start rounds of testing over the next few days to determine which neighborhoods can safely be allowed a limited amount of freedom of movement, as residents in Beijing watch carefully on word for whether the capital city will lock down. (AP Photo/Ng Han Guan) A worker takes a swab sample from a resident for a COVID test Wednesday, April 27, 2022, in Beijing. Shanghai city authorities said Wednesday they will start rounds of testing over the next few days to determine which neighborhoods can safely be allowed a limited amount of freedom of movement, as residents in Beijing watch carefully on word for whether the capital city will lock down. (AP Photo/Ng Han Guan) Residents line up in the rain for COVID test on Wednesday, April 27, 2022, in Beijing. Shanghai city authorities said Wednesday they will start rounds of testing over the next few days to determine which neighborhoods can safely be allowed a limited amount of freedom of movement, as residents in Beijing watch carefully on word for whether the capital city will lock down. (AP Photo/Ng Han Guan) Residents line up in the rain for COVID test on Wednesday, April 27, 2022, in Beijing. Shanghai city authorities said Wednesday they will start rounds of testing over the next few days to determine which neighborhoods can safely be allowed a limited amount of freedom of movement, as residents in Beijing watch carefully on word for whether the capital city will lock down. (AP Photo/Ng Han Guan) A worker takes a swab sample from a resident for COVID test on Wednesday, April 27, 2022, in Beijing. Shanghai city authorities said Wednesday they will start rounds of testing over the next few days to determine which neighborhoods can safely be allowed a limited amount of freedom of movement, as residents in Beijing watch carefully on word for whether the capital city will lock down. (AP Photo/Ng Han Guan) Residents line up in the rain for COVID test on Wednesday, April 27, 2022, in Beijing. Shanghai city authorities said Wednesday they will start rounds of testing over the next few days to determine which neighborhoods can safely be allowed a limited amount of freedom of movement, as residents in Beijing watch carefully on word for whether the capital city will lock down. (AP Photo/Ng Han Guan) Residents line up for COVID test on Wednesday, April 27, 2022, in Beijing. Shanghai city authorities said Wednesday they will start rounds of testing over the next few days to determine which neighborhoods can safely be allowed a limited amount of freedom of movement, as residents in Beijing watch carefully on word for whether the capital city will lock down. (AP Photo/Ng Han Guan) Residents line up in the rain for COVID test on Wednesday, April 27, 2022, in Beijing. Workers put up fencing and police restricted who could leave a locked-down area in Beijing on Tuesday as authorities in the Chinese capital stepped up efforts to prevent a major COVID-19 outbreak like the one that has all but shut down the city of Shanghai. (AP Photo/Ng Han Guan) A volunteer wearing a red cap adjusts his mask as residents line up for mass COVID test, Wednesday, April 27, 2022, in Beijing. Workers put up fencing and police restricted who could leave a locked-down area in Beijing on Tuesday as authorities in the Chinese capital stepped up efforts to prevent a major COVID-19 outbreak like the one that has all but shut down the city of Shanghai. (AP Photo/Ng Han Guan) A volunteer adjusts a flag with the words "Militia Emergency Response team" at a COVID mass testing site, Wednesday, April 27, 2022, in Beijing. Workers put up fencing and police restricted who could leave a locked-down area in Beijing on Tuesday as authorities in the Chinese capital stepped up efforts to prevent a major COVID-19 outbreak like the one that has all but shut down the city of Shanghai. (AP Photo/Ng Han Guan) Residents line up for COVID test, Wednesday, April 27, 2022, in Beijing. Workers put up fencing and police restricted who could leave a locked-down area in Beijing on Tuesday as authorities in the Chinese capital stepped up efforts to prevent a major COVID-19 outbreak like the one that has all but shut down the city of Shanghai. (AP Photo/Ng Han Guan) A man wearing a mask walks to a line for COVID test, Wednesday, April 27, 2022, in Beijing. Workers put up fencing and police restricted who could leave a locked-down area in Beijing on Tuesday as authorities in the Chinese capital stepped up efforts to prevent a major COVID-19 outbreak like the one that has all but shut down the city of Shanghai. (AP Photo/Ng Han Guan) A resident gets swabbed during a mass COVID test, Wednesday, April 27, 2022, in Beijing. Workers put up fencing and police restricted who could leave a locked-down area in Beijing on Tuesday as authorities in the Chinese capital stepped up efforts to prevent a major COVID-19 outbreak like the one that has all but shut down the city of Shanghai. (AP Photo/Ng Han Guan) Residents line up for COVID test, Wednesday, April 27, 2022, in Beijing. Workers put up fencing and police restricted who could leave a locked-down area in Beijing on Tuesday as authorities in the Chinese capital stepped up efforts to prevent a major COVID-19 outbreak like the one that has all but shut down the city of Shanghai. (AP Photo/Ng Han Guan)