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A child reacts to a throat swab during mass testing for COVID-19 in Wuhan in central China's Hubei province Tuesday, Aug. 3, 2021. The coronavirusâÄ™s delta variant is challenging ChinaâÄ™s costly strategy of isolating cities, prompting warnings that Chinese leaders who were confident they could keep the virus out of the country need a less disruptive approach. (KEYSTONE/Chinatopix via AP)