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Residents wait to undergo nucleic acid tests for COVID-19 at a middle school in Lanzhou, in China's northwestern Gansu province, on Oct. 25, 2021. (AFP)

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Police officers man a checkpoint where COVID-19 test results are required for entry and exit from Lanzhou on October 26, 2021. (AFP)

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This photo taken on October 25, 2021 shows a child undergoing a nucleic acid test for the COVID-19 at a primary school in Lanzhou. (AFP)

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Workers staff a makeshift nucleic acid testing laboratory during a mass testing following an increase in COVID-19 cases in Lanzhou on October 25, 2021. (CNS photo via Reuters)

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Workers disinfect a residential building in Lanzhou on October 26, 2021. (AFP)

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A medical worker in a protective suit collects a swab from a resident at a free nucleic acid testing site following new cases of COVID-19, in Lanzhou's Chengguan district. (CNS photo via REUTERS)

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Residents line up to receive a swab for COVID-19 testing in Lanzhou on Oct. 24, 2021. (Xinhua via AP)

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