Over 2.221 bln COVID-19 vaccine doses administered on Chinese mainland

A medical worker administers a dose of the COVID-19 vaccine to a boy at a vaccination site in Xuhui District of Shanghai, east China, Sept. 3, 2021. (Xinhua/Liu Ying)

BEIJING, Oct. 11 (Xinhua) -- Over 2.221 billion doses of COVID-19 vaccine had been administered on the Chinese mainland as of Sunday, data from the National Health Commission showed Monday.