About 91 percent of students aged 12 to 17 have received two doses of COVID-19 vaccines in China, said a notice from China's Ministry of Education (MOE) on Wednesday.
The two-dose vaccination rate of teachers and students over 18 years old have exceeded 95 percent, said the ministry.
The MOE urged schools to strengthen coronavirus prevention and control work on campus, especially with the two national holidays of the Mid-Autumn Festival and the National Day coming.
The notice came after the National Health Commission on Monday said COVID-19 was detected spreading at a primary school in Putian, East China's Fujian Province, for 10 days before the first case was identified in the country's fresh flare-up.
At least 20 children younger than 12 years old were found to have been infected amid the nation's first school-centered COVID-19 resurgence.
The Chinese mainland reported 50 new COVID-19 cases on Wednesday, all from Fujian Province. It is the second day that the country has seen cases reaching 50 amid the latest resurgence that started on Friday in Putian.
Multiple cities in Fujian, such as Quanzhou and Fuzhou, have either suspended primary schools and kindergartens or changed classes offline to online.