Police officers in protective gear guide residents lining up for Covid tests 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. (AP Photo/Chen Si)(AP PHOTO/CHEN SI)