BEIJING, Dec. 31 (Xinhua) -- China announced on Thursday that it had granted conditional marketing authorization for a self-developed COVID-19 vaccine. [caption id="attachment_54632" align="alignnone" width="720"] A staff member works at the packaging workshop of COVID-19 inactivated vaccine products of the Beijing Biological Products Institute Co., Ltd. in Beijing, capital of China, Dec. 25, 2020. (Xinhua/Zhang Yuwei)[/caption] [caption id="attachment_54633" align="alignnone" width="720"] A staff member checks the packaging quality of COVID-19 inactivated vaccine products at a packaging plant of the Beijing Biological Products Institute Co., Ltd. in Beijing, capital of China, Dec. 25, 2020. (Xinhua/Zhang Yuwei)[/caption]