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Photo taken on March 20, 2020 shows a library closed due to COVID-19 epidemic in New Orleans, Louisiana, the United States. The number of COVID-19 cases in the United States topped 20,000 as of 1:30 p.m. local time on Saturday (1730 GMT), according to the Center for Systems Science and Engineering (CSSE) at Johns Hopkins University. (Photo by Lan Wei/Xinhua)