Yan Weifan, one of the students inoculated at the center, said he just graduated from a university in Hong Kong, Shenzhen's neighboring city, and needs to go back for his diploma.

He waited about one hour in the health center to receive the shot. "It felt like having a normal injection with (his arm) a little sore and swollen," he said.

Song Shuyi, director of the health center, said they vaccinated about 400 people on the first day, while the number of reservations on the second and third days was 800 to 1,000.

Most were students who plan to study abroad, she said.

She highlighted that the health center has above 10,000 vaccines in stock so the supply can fully meet daily demand, and they would vaccinate as many people as they could.

The director admitted that some vaccine recipients felt a little pain and soreness on the arm, but she did not find any cases with serious adverse effects.