Shanghai erects metal barriers in fight against COVID-19


              A woman lifts a child to get a COVID-19 test at a private mobile coronavirus testing facility, Sunday, April 24, 2022, in Beijing. (AP Photo/Andy Wong)
            
              A security guard wearing a face mask stands watch as masked residents using their smartphone to scan their health code at a barricaded entrance to a commercial office complex, Sunday, April 24, 2022, in Beijing. Beijing is on alert after 10 middle school students tested positive for COVID-19, in what city officials said was an initial round of testing. (AP Photo/Andy Wong)
            A man wearing a face mask walks by a masked security stands guard at a barricaded entrance displaying a health QR code and a temperature scanner at a commercial office complex, Sunday, April 24, 2022, in Beijing. Beijing is on alert after 10 middle school students tested positive for COVID-19, in what city officials said was an initial round of testing. (AP Photo/Andy Wong) A woman wearing a face mask to help protect from the coronavirus walks by a barricaded construction wall displaying a fashion cartoon at a mall Sunday, April 24, 2022, in Beijing. Beijing is on alert after 10 middle school students tested positive for COVID-19, in what city officials said was an initial round of testing. (AP Photo/Andy Wong) Workers line up to get a throat swab sample taken at a coronavirus test site set up near a commercial office complex, Sunday, April 24, 2022, in Beijing. Beijing is on alert after 10 middle school students tested positive for COVID-19, in what city officials said was an initial round of testing. (AP Photo/Andy Wong) A woman lifts her child to get a COVID-19 test at a private mobile coronavirus testing facility, Sunday, April 24, 2022, in Beijing. (AP Photo/Andy Wong) A worker has a throat swab sample taken at a coronavirus test site set up near a commercial office complex, Sunday, April 24, 2022, in Beijing. Beijing is on alert after 10 middle school students tested positive for COVID-19, in what city officials said was an initial round of testing. (AP Photo/Andy Wong)