A medical worker inoculates a citizen with a booster shot of COVID-19 vaccine at a vaccination clinic in Panyu District of Guangzhou City, South China's Guangdong Province, Oct 18, 2021. (Photo: Xinhua)
BEIJING, Oct. 23 (Xinhua) -- More than 2.243 billion doses of COVID-19 vaccines had been administered on the Chinese mainland as of Friday, data from the National Health Commission showed Saturday.