Residents who will receive the second dose of COVID-19 vaccine walk in line to a vaccination spot in Chaoyang District of Beijing, capital of China, Jan. 26, 2021. According to the official plan, the second dose of COVID-19 inoculation of the key groups in Beijing started on Jan. 22, and will complete by Feb. 8. Beijing has completed administering the first dose of the jab among specific groups of people with higher infection risks by Jan. 19, and over 1.9 million people in Beijing have received the first dose of COVID-19 vaccine. (Xinhua/Liu Jinhai)

A volunteer answers questions from a resident who received her second dose of COVID-19 vaccine at a vaccination spot in Chaoyang District of Beijing, capital of China, Jan. 26, 2021. According to the official plan, the second dose of COVID-19 inoculation of the key groups in Beijing started on Jan. 22, and will complete by Feb. 8. Beijing has completed administering the first dose of the jab among specific groups of people with higher infection risks by Jan. 19, and over 1.9 million people in Beijing have received the first dose of COVID-19 vaccine. (Xinhua/Li Mengxin)

Staff members help residents to go through process and register information at a vaccination spot in Chaoyang District of Beijing, capital of China, Jan. 26, 2021. According to the official plan, the second dose of COVID-19 inoculation of the key groups in Beijing started on Jan. 22, and will complete by Feb. 8. Beijing has completed administering the first dose of the jab among specific groups of people with higher infection risks by Jan. 19, and over 1.9 million people in Beijing have received the first dose of COVID-19 vaccine. (Xinhua/Liu Jinhai)

A volunteer works at a vaccination spot in Chaoyang District of Beijing, capital of China, Jan. 26, 2021. According to the official plan, the second dose of COVID-19 inoculation of the key groups in Beijing started on Jan. 22, and will complete by Feb. 8. Beijing has completed administering the first dose of the jab among specific groups of people with higher infection risks by Jan. 19, and over 1.9 million people in Beijing have received the first dose of COVID-19 vaccine. (Xinhua/Liu Jinhai)

Staff members help residents to go through process and register information at a vaccination spot in Chaoyang District of Beijing, capital of China, Jan. 26, 2021. According to the official plan, the second dose of COVID-19 inoculation of the key groups in Beijing started on Jan. 22, and will complete by Feb. 8. Beijing has completed administering the first dose of the jab among specific groups of people with higher infection risks by Jan. 19, and over 1.9 million people in Beijing have received the first dose of COVID-19 vaccine. (Xinhua/Jia Haocheng)

A volunteer guides residents who received the second dose of COVID-19 vaccine to the observation area at a vaccination spot in Chaoyang District of Beijing, capital of China, Jan. 26, 2021. According to the official plan, the second dose of COVID-19 inoculation of the key groups in Beijing started on Jan. 22, and will complete by Feb. 8. Beijing has completed administering the first dose of the jab among specific groups of people with higher infection risks by Jan. 19, and over 1.9 million people in Beijing have received the first dose of COVID-19 vaccine. (Xinhua/Liu Jinhai)