Entertainment Moderna doubles size of COVID-19 vaccine pediatric study By qatar day - August 13, 2021 0 599 Facebook Twitter Pinterest WhatsApp Moderna doubles size of COVID-19 vaccine pediatric study – August 12, 2021 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…