Chile weighing issue of third booster dose of COVID-19 vaccine

Chile is studying the possibility of issuing a third, booster dose of COVID-19 vaccines, its president said on Tuesday, as the country seeks to beat back the latest wave of infections amid questions about how effective the widely used Sinovac vaccine is against more transmissible virus variants. President Sebastian Pinera said health experts were examining 'many scientific studies' to determine if a third dose would be necessary as he launched the rollout of vaccines among teenagers in Chile.