Kids head for the observation area after receiving COVID-19 vaccine at a vaccination site in Pingxiang City, south China's Guangxi Zhuang Autonomous Region, Nov. 16, 2021. Pingxiang recently launched a COVID-19 vaccination campaign for children aged 3 to 11. (Xinhua/Cao Yiming)

More than 2.4 billion doses of COVID-19 vaccines had been administered on the Chinese mainland as of Tuesday, data from the National Health Commission showed Wednesday.