Health workers work at a testing station in Shibei District of Qingdao, east China's Shandong Province, Oct. 14, 2020. Over 5.6 million samples for nucleic acid testing have been collected by 8:30 p.m. on Tuesday in east China's Qingdao, after it began a city-wide testing campaign on Monday. (Xinhua/Li Ziheng)
