A security member wearing a protective mask stands guard outside the COVID-19 testing center at Borussia Dortmund's stadium in Dortmund, Germany, April 4, 2020. Borussia Dortmund's stadium housed a COVID-19 testing center From Saturday. Rooms in the Westfalenstadion's north stand have been prepared to take in people suspected of suffering from COVID-19. It is hoped the center will relieve pressure on the medical facilities in the city of Dortmund. (Photo by Joachim Bywaletz/Xinhua)