Photo taken on Jan. 6, 2021 shows the packing line for inactivated COVID-19 vaccine of Sinovac Biotech, a Chinese biopharmaceutical company, in Beijing, capital of China. (Xinhua/Zhang Yuwei)

BEIJING, May 3 (Xinhua) -- More than 275.34 million doses of COVID-19 vaccines had been administered across China as of Sunday, the National Health Commission said Monday.