A medical worker prepares a dose of COVID-19 vaccine at a community medical service center in Changsha, central China's Hunan Province, Nov. 15, 2021. (Xinhua/Chen Zeguo)
BEIJING, Nov. 23 (Xinhua) -- Nearly 2.443 billion doses of COVID-19 vaccine had been administered on the Chinese mainland as of Monday, data from the National Health Commission showed Tuesday. ■