Medical workers wait to submit the COVID-19 samples for nucleic acid test at the center for disease control and prevention in Fengman District of Jilin City, northeast China's Jilin Province, May 17, 2020. Jilin Province reported three new confirmed COVID-19 cases on Saturday, local health authorities said Sunday. The district's risk associated with the virus has been upgraded from the medium-level to the high-level after reports of the three new cases. (Xinhua/Yan Linyun)
