Passengers check their telephones next to a sign indicating the way to a sanitary control point for passengers arriving from countries listed as Covid-19 red zones, in Roissy Charles de Gaulle airport in Roissy, near Paris, on April 25, 2021. - Passengers arriving in France from Brazil, Chile, Argentina, South Africa, India and Guyana must submit to a Covid-19 antigenic test and follow a 10 day quarantine at home, to curb the spread of coronavirus variants. (Photo by Ian LANGSDON / POOL / AFP)