Chile begins to apply the fourth dose of the vaccine against Covid-19
epa09677292 A woman poses for a photo with her vaccination card after receiving the fourth dose of the Covid-19 vaccine, at a vaccination center in Santiago, Chile, 10 January 2022. On 10 January, Chile becomes the second country in the world after Israel to begin applying the fourth dose of the vaccine against Covid-19, at a time when the Omicron variant and the high mobility of the Christmas holidays have triggered infections. EPA/Alberto Valdes
