Russian medical experts walk to start their shift to check passengers arriving from foreign countries at Sheremetyevo airport outside Moscow, Russia, Thursday, March 19, 2020. Authorities in Russia are taking vast measures to prevent the spread of the COVID-19 virus in the country. The measures include closing the border for all foreigners, shutting down schools for three weeks, sweeping testing and urging people to stay home. For most people, the new coronavirus causes only mild or moderate symptoms. For some it can cause more severe illness. (AP Photo/Pavel Golovkin)