A medical worker (R) inoculates a recipient with a 2nd dose of COVID-19 vaccine at a temporary vaccination site in Haidian District of Beijing, capital of China, Jan. 29, 2021. The administration of the second dose of COVID-19 vaccines for key groups of residents throughout Beijing started on Jan. 22, and is expected to conclude before Feb. 8. (Xinhua/Ren Chao)
