Lions, tigers in U.S. national zoo test presumptive positive for coronavirus (3)

Undated photo provided by Smithsonian's National Zoo shows a tiger at Smithsonian's National Zoo in Washington, D.C., the United States. All of the lions and tigers living in the Smithsonian's National Zoo in U.S. capital Washington, D.C. have tested presumptive positive for coronavirus, the zoo said in a press release on Friday. (Smithsonian's National Zoo/Handout via Xinhua)