U.S. confirmed COVID-19 cases top 20,000: Johns Hopkins University

Medical workers work 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)