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A worker disinfects the flooring outside the inflated cabins at the pop-up Huo-Yan Laboratory set up in an expo center to test samples for covid-19 virus in Nanjing in east China's Jiangsu province Wednesday, July 28, 2021. China's worst coronavirus outbreak since the start of the pandemic a year and a half ago escalated Wednesday, Aug. 4, 2021, with dozens more cases around the country, the sealing-off of one city and the punishment of its local leaders. (Photo by Chinatopix via AP Photo)
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