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Chinese authorities are targeting students as part of their latest vaccination campaign, as China sees its biggest virus surge in months.
The government reported 71 new domestic cases on Wednesday - the highest daily count since January.
A vaccination campaign for minors aged 12 to 17 is being expanded to try and combat the spread of the highly contagious delta variant.
The latest cases have now spread to at least 16 provinces and municipalities.
It is unclear how many in China are fully vaccinated, although authorities say more than 1.6 billion doses have been administered so far.
Several provinces are already giving school students the jab, but the pressure is on to achieve the government's target of having 80 to 85 percent of the entire population vaccinated by the end of the year.
However, local media pointed to doubts over whether current prevention measures to combat the virus are still working.
Experts quoted said the outbreak was under control but more efforts were needed to "plug the loopholes" in controlling the virus, alongside vaccinations and social distancing.
The latest outbreak started in Nanjiang in the eastern Jiangsu province before spreading to the tourist destination of Zhangjiajie in central Hunan province.
From there, tourists carried the virus to at least a dozen cities, including large hubs like Beijing and Chongqing.
The city of Yangzhou, which is also in Jiangsu and has a population of more than 4.5 million people, has been put under restrictions after 40 cases were detected.
It's thought a 64-year-old woman, who travelled from Nanjiang to Yangzhou and visited popular parlours to play cards, is responsible for the spike in the city.
She is now being investigated by police for hiding her travel itinerary from authorities.
Wuhan to test whole population as virus resurfaces
Concerns in China as Delta Covid outbreak spreads
Authorities in Wuhan have also started testing the entire population of 11 million people after a handful of cases were detected.
The city was thrown into the spotlight after the coronavirus first emerged there in 2019.
The gambling hub of Macau is also testing all 600,000 residents, after the city recorded four new coronavirus cases.
Local media has reported that some of the people who have tested positive were fully vaccinated, leading to discussion online about the threat of breakthrough infections and whether a booster shot is needed.