CORONAVIRUS: 疾病預防控制中心主任說，可能不需要每年注射加強針，第三針可能足以提供所需的長期保護。
CORONAVIRUS: Director of the CDC says annual booster shots may not be required and that a third shot may be enough to offer the long-term protection needed
— The Spectator Index (@spectatorindex) 2021-08-21 13:40