People head to the COVID-19 vaccination room at a temporary vaccination site in Haidian District of Beijing, capital of China, Jan. 6, 2021. (Photos: Xinhua)

A medical worker inoculates a recipient with a COVID-19 vaccine at a temporary vaccination site in Haidian District of Beijing, capital of China, Jan. 6, 2021.

Medical workers prepare for the COVID-19 vaccination at a temporary vaccination site in Haidian District of Beijing, capital of China, Jan. 6, 2021.

A medical worker inoculates a recipient with a COVID-19 vaccine at a temporary vaccination site in Haidian District of Beijing, capital of China, Jan. 6, 2021.

A medical worker registers for a woman before the COVID-19 vaccination at a temporary vaccination site in Haidian District of Beijing, capital of China, Jan. 6, 2021.

People wait in an observation area after receiving their COVID-19 vaccines at a temporary vaccination site in Haidian District of Beijing, capital of China, Jan. 6, 2021.

A medical worker prepares for the COVID-19 vaccination at a temporary vaccination site in Haidian District of Beijing, capital of China, Jan. 6, 2021.

A medical worker checks on a man who received a COVID-19 vaccine at a temporary vaccination site in Haidian District of Beijing, capital of China, Jan. 6, 2021.

Medical workers prepare for the COVID-19 vaccination at a temporary vaccination site in Haidian District of Beijing, capital of China, Jan. 6, 2021.