Residents present their health code before entering a community-based vaccination site in Haidian district of Beijing to receive a COVID-19 booster jab, Nov. 2, 2021. [Photo by Xu Xiaoxuan/China.org.cn]

Residents queue up to receive a COVID-19 booster jab at a community-based vaccination site in Haidian district of Beijing, Nov. 2, 2021. [Photo by Xu Xiaoxuan/China.org.cn] 

Residents queue up to receive a COVID-19 booster jab at a community-based vaccination site in Haidian district of Beijing, Nov. 2, 2021. [Photo by Xu Xiaoxuan/China.org.cn] 

A man aged over 60 (R) goes to get his COVID-19 vaccination shot in Haidian district of Beijing, Nov. 2, 2021. [Photo by Xu Xiaoxuan/China.org.cn] 

Vaccine recipients stay in an observation area in Haidian district of Beijing for 30 minutes to guard against any adverse reactions, Nov. 2, 2021. [Photo by Xu Xiaoxuan/China.org.cn]