China has fully vaccinated 91 percent of students aged 12-17 against the coronavirus, state television reported on Wednesday, although authorities said schools need to be vigilant.

An outbreak in the southeastern province of Fujian this month that has grown to 152 cases includes infections among unvaccinated students in at least four primary schools and two kindergartens, data from local authorities showed.

China's two main vaccines have been approved for use in children from...