An Estonian border guard measures the temperature of a traveller at the border crossing with Russia in Narva, Estonia, March 9, 2020. Estonian authorities take measures like temperature checking and leaflets distributing to stem the spread of the novel coronavirus. (Photo by Sergei Stepanov/Xinhua)

Photo taken on March 9, 2020 shows a leaflet introducing epidemic prevention and control knowledge at a border checkpoint in Narva, Estonia. Estonian authorities take measures like temperature checking and leaflets distributing to stem the spread of the novel coronavirus. (Photo by Sergei Stepanov/Xinhua)