S. Korea shortens dosage interval of Covid booster shots for waning im… stocking 0 40 2021.11.18 10:22 https://youtu.be/vHV2vpuIKWA + 30 추가접종 기간 단축, 돌파감염, 중증진행 예방효과 있을까 South Korea's health authorities have shortened the COVID-19 vaccine interval between primary doses ...