A medical worker prepares reagent for nucleic acid test at Yuhuangding Hospital in Yantai, east China's Shandong Province, Aug. 7, 2021. Yantai had completed the first round of nucleic acid testing citywide with zero positive result, according to a press conference held on Saturday. The second round of nucleic acid testing has started. (Photo by Tang Ke/Xinhua)
Medical workers arrange samples for COVID-19 test at Yuhuangding Hospital in Yantai, east China's Shandong Province, Aug. 7, 2021. Yantai had completed the first round of nucleic acid testing citywide with zero positive result, according to a press conference held on Saturday. The second round of nucleic acid testing has started. (Photo by Tang Ke/Xinhua)
