Wuhan residents wearing face masks wait in a line to be tested of COVID-19 in a neighborhood in Wuhan, in Chinas central Hubei province on May 15, 2020. China has largely brought the virus under control, but the emergence of new cases in Wuhan in recent days, after weeks without fresh infections, has prompted a campaign to test all 11 million residents in the city where COVID-19 first emerged late last year. (Photo by Hector Retamal/AFP Photo)
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