A medical worker shows stickers for residents who finished a new round of COVID-19 test in Laoshan District of Qingdao, east China's Shandong Province, March 17, 2022. Qingdao launched a third round of mass COVID-19 testing. (Xinhua/Li Ziheng)
A medical worker takes a swab sample for nucleic acid test from a resident in Laoshan District of Qingdao, east China's Shandong Province, March 17, 2022. Qingdao launched a third round of mass COVID-19 testing. (Xinhua/Li Ziheng)
A medical worker takes a swab sample for nucleic acid test from a resident in Laoshan District of Qingdao, east China's Shandong Province, March 17, 2022. Qingdao launched a third round of mass COVID-19 testing. (Xinhua/Li Ziheng)
