BENGBU, July 17, 2022 A medical worker takes a swab sample from a citizen for nucleic acid testing in Bengshan District of Bengbu City, east China's Anhui Province, July 16, 2022.. Bengbu in Anhui has started a new round of mass nucleic acid testing from Saturday to Sunday, as the city races against time to contain the latest resurgence of COVID-19 infections. (Credit Image: å© Zhou Mu/Xinhua via ZUMA Press)