![](http://www.ecns.cn/hd/2021/07/30/8dd148d1fa3a4ea4954ad3e5cbf3d711.jpg)
A medical worker administers a dose of COVID-19 vaccine for a student at a high school in Shenzhen, south China's Guangdong Province, July 29, 2021. The city started COVID-19 vaccination for minors aged between 12 and 17 on Thursday. (Xinhua/Mao Siqian)
![](http://www.ecns.cn/hd/2021/07/30/b73e6e08f0024213b072cfd888f6ca72.jpg)
A medical worker prepares a dose of COVID-19 vaccine at a high school in Shenzhen, south China's Guangdong Province, July 29, 2021. The city started COVID-19 vaccination for minors aged between 12 and 17 on Thursday. (Xinhua/Mao Siqian)
![](http://www.ecns.cn/hd/2021/07/30/f2b34314aec741f39b385bbf90ec3262.jpg)
A medical worker administers a dose of COVID-19 vaccine for a student at a high school in Shenzhen, south China's Guangdong Province, July 29, 2021. The city started COVID-19 vaccination for minors aged between 12 and 17 on Thursday. (Xinhua/Mao Siqian)
![](http://www.ecns.cn/hd/2021/07/30/089482eea9664b8299303c4c86a26654.jpg)
A medical worker administers a dose of COVID-19 vaccine for a student at a high school in Shenzhen, south China's Guangdong Province, July 29, 2021. The city started COVID-19 vaccination for minors aged between 12 and 17 on Thursday. (Xinhua/Mao Siqian)
![](http://www.ecns.cn/hd/2021/07/30/27217c8a527f4dbb85ebcc798a4e10de.jpg)
Students wait in line to receive COVID-19 vaccine at a high school in Shenzhen, south China's Guangdong Province, July 29, 2021. The city started COVID-19 vaccination for minors aged between 12 and 17 on Thursday. (Xinhua/Mao Siqian)
![](http://www.ecns.cn/hd/2021/07/30/1bf7b62dade94dbba51d4304bbab99f2.jpg)
Students stay for observation after receiving COVID-19 vaccine at a high school in Shenzhen, south China's Guangdong Province, July 29, 2021. The city started COVID-19 vaccination for minors aged between 12 and 17 on Thursday. (Xinhua/Mao Siqian)