A medical worker prepares to administer a dose of the recombinant COVID-19 vaccine (adenovirus type 5 vector) which requires only one shot at a temporary vaccination site in Haidian district of Beijing, May 20, 2021. (Photo/Xinhua)
The number of COVID-19 vaccine doses administered on the Chinese mainland grew by around 4.48 million from the previous day on Saturday, with the total number reaching nearly 3.157 billion, data from the National Health Commission showed Sunday.
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