A student registers for vaccination at a vaccination point of Wenshu middle school in Nanjing, east China's Jiangsu Province, Aug. 23, 2021. Nanjing started administering the first dose of COVID-19 vaccines among minors aged between 12 and 17. (Photos: Xinhua)

Students queue to receive COVID-19 vaccines at a vaccination point of Wenshu middle school in Nanjing, east China's Jiangsu Province, Aug. 23, 2021. Nanjing started administering the first dose of COVID-19 vaccines among minors aged between 12 and 17.

A student receives a dose of COVID-19 vaccine at a vaccination point of Wenshu middle school in Nanjing, east China's Jiangsu Province, Aug. 23, 2021. Nanjing started administering the first dose of COVID-19 vaccines among minors aged between 12 and 17.

A student receives a dose of COVID-19 vaccine at a vaccination point of Wenshu middle school in Nanjing, east China's Jiangsu Province, Aug. 23, 2021. Nanjing started administering the first dose of COVID-19 vaccines among minors aged between 12 and 17.

A teacher gives direction as a student enter to receive a dose of COVID-19 vaccine at a vaccination point of Wenshu middle school in Nanjing, east China's Jiangsu Province, Aug. 23, 2021. Nanjing started administering the first dose of COVID-19 vaccines among minors aged between 12 and 17.

A student waits to receive a dose of COVID-19 vaccine at a vaccination point of Wenshu middle school in Nanjing, east China's Jiangsu Province, Aug. 23, 2021. Nanjing started administering the first dose of COVID-19 vaccines among minors aged between 12 and 17.

A student waits to receive a dose of COVID-19 vaccine at a vaccination point of Wenshu middle school in Nanjing, east China's Jiangsu Province, Aug. 23, 2021. Nanjing started administering the first dose of COVID-19 vaccines among minors aged between 12 and 17.