A medical worker administers a dose of COVID-19 vaccine to a girl student at the Hangtian Campus of the Beijing Yuying School in Beijing, capital of China, on Aug. 21, 2021.(Xinhua)

91% of Chinese students aged 12 to 17 have received two COVID-19 vaccine doses, while the two-dose vaccination rate for teachers and students over 18 years old has already exceeded 95%: Ministry of Education said.