A medical worker inoculates a recipient with a COVID-19 vaccine at a temporary inoculation site in Haidian District in Beijing, capital of China, Jan. 11, 2021. Over 1 million people in Beijing had received the first dose of COVID-19 vaccine as of 11 a.m. Monday, the municipal health commission said. (Photos: Xinhua)

A medical worker inoculates a recipient with a COVID-19 vaccine at a temporary inoculation site in Haidian District in Beijing, capital of China, Jan. 6, 2021. Over 1 million people in Beijing had received the first dose of COVID-19 vaccine as of 11 a.m. Monday, the municipal health commission said.

A medical worker inoculates a recipient with a COVID-19 vaccine at a temporary inoculation site in Haidian District in Beijing, capital of China, Jan. 6, 2021. Over 1 million people in Beijing had received the first dose of COVID-19 vaccine as of 11 a.m. Monday, the municipal health commission said.

A medical worker inoculates a recipient with a COVID-19 vaccine at a temporary inoculation site in Haidian District in Beijing, capital of China, Jan. 6, 2021. Over 1 million people in Beijing had received the first dose of COVID-19 vaccine as of 11 a.m. Monday, the municipal health commission said.

A medical worker prepares a COVID-19 vaccine shot at a temporary inoculation site in Haidian District in Beijing, capital of China, Jan. 11, 2021. Over 1 million people in Beijing had received the first dose of COVID-19 vaccine as of 11 a.m. Monday, the municipal health commission said.

A medical worker scans a dose of COVID-19 vaccine when preparing for inoculation at a temporary inoculation site in Haidian District in Beijing, capital of China, Jan. 11, 2021. Over 1 million people in Beijing had received the first dose of COVID-19 vaccine as of 11 a.m. Monday, the municipal health commission said.

A member of staff guides recipients for orderly inoculation with COVID-19 vaccines at a temporary inoculation site in Haidian District in Beijing, capital of China, Jan. 11, 2021. Over 1 million people in Beijing had received the first dose of COVID-19 vaccine as of 11 a.m. Monday, the municipal health commission said.

A medical worker inoculates a recipient with a COVID-19 vaccine at a temporary inoculation site in Haidian District in Beijing, capital of China, Jan. 11, 2021. Over 1 million people in Beijing had received the first dose of COVID-19 vaccine as of 11 a.m. Monday, the municipal health commission said.

A medical worker (1st L) inquires a recipient of his physical condition after receiving a COVID-19 vaccine shot at a temporary inoculation site in Haidian District in Beijing, capital of China, Jan. 11, 2021. Over 1 million people in Beijing had received the first dose of COVID-19 vaccine as of 11 a.m. Monday, the municipal health commission said.

A medical worker inoculates a recipient with a COVID-19 vaccine at a temporary inoculation site in Haidian District in Beijing, capital of China, Jan. 11, 2021. Over 1 million people in Beijing had received the first dose of COVID-19 vaccine as of 11 a.m. Monday, the municipal health commission said.

A medical worker prepares for COVID-19 vaccine inoculation at a temporary inoculation site in Haidian District in Beijing, capital of China, Jan. 11, 2021. Over 1 million people in Beijing had received the first dose of COVID-19 vaccine as of 11 a.m. Monday, the municipal health commission said.

A medical worker registers a recipient before COVID-19 vaccine inoculation at a temporary inoculation site in Haidian District in Beijing, capital of China, Jan. 11, 2021. Over 1 million people in Beijing had received the first dose of COVID-19 vaccine as of 11 a.m. Monday, the municipal health commission said.