A staff member collects sample to check the condition of Vero cell culture at the COVID-19 vaccine stock solution workshop in trial operation at Sinovac Life Sciences Co., Ltd. in Beijing, capital of China, July 15, 2020.

Staff members prepare silicone tubes at the COVID-19 vaccine workshop of Sinovac Life Sciences Co., Ltd. in Beijing, capital of China, Jan. 6, 2021.

A staff member performs random sample check on inactivated COVID-19 vaccine in vials at a packing line of Sinovac Life Sciences Co., Ltd. in Beijing, capital of China, on Jan. 6, 2021.

Staff members check automated vial cleansing line and tunnel drying oven at the COVID-19 vaccine workshop of Sinovac Life Sciences Co., Ltd. in Beijing, capital of China, Jan. 6, 2021.