FILE PHOTO: Health worker Carla Diaz holds a vial of the Moderna vaccine against the coronavirus disease (COVID-19) at a vaccination center in Buenos Aires, Argentina August 9, 2021. REUTERS/Agustin Marcarian
FILE PHOTO: Health worker Carla Diaz holds a vial of the Moderna vaccine against the coronavirus disease (COVID-19) at a vaccination center in Buenos Aires, Argentina August 9, 2021. REUTERS/Agustin Marcarian