A medical worker inoculates a man with a COVID-19 vaccine at a vaccination site in Daxing District of Beijing, capital of China, Jan. 3, 2021. Beijing has started administering COVID-19 vaccines among specific groups of people with higher infection risks. Nine groups of people aged 18 to 59 will receive the vaccine before the Spring Festival of 2021, which falls on Feb. 12.(Photo: Xinhua)