But the pace picked up significantly in May, with more than 500 million shots given over the past month, according to data from the NHC.

"It took China 25 days to climb from 100 million doses to 200 million doses, 16 days to increase from 200 million to 300 million, and six days from 800 million to 900 million," Xinhua reported.

Beijing has successfully contained the virus but several recent local outbreaks, including in the northern Anhui and Liaoning provinces and Guangdong in the south, have fueled fears of infections, prompting a rush to get vaccinated in affected regions.

China has also begun to vaccinate people under the age of 18, with teenagers eligible to receive the Sinopharm and Sinovac vaccines.

For those still reluctant, China has a powerful tool in its arsenal: a top-down, one-party system that is all-encompassing in reach and forceful in action, and a sprawling bureaucracy that can be swiftly mobilized.

Beijing aims to vaccinate at least 70% of eligible people by the end of the year, Xinhua reported, citing the deputy head of the NHC Zeng Yixin.

Around 1.4 billion people live in China.

Due to this, the country's administered doses per 100 people is still behind nations such as the US and Britain.

But if its inoculation drive can keep up the current pace, Beijing will catch up fast.