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People wait inside cars to be tested at a drive-through COVID-19 testing site in Dallas, Texas, the United States, March 21, 2020. The number of COVID-19 cases in the United States topped 20,000 as of 1:30 p.m. Eastern Standard Time on Saturday (1730 GMT), according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. (Photo by Dan Tian/Xinhua)