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A medical worker displays China's Sinovac COVID-19 vaccine before the vaccination at a hospital in Baku, Azerbaijan, Jan. 18, 2021. Azerbaijan's senior health officials on Monday took their first inoculations of a vaccine made by Chinese biopharmaceutical company Sinovac Biotech, marking the beginning of mass vaccination against COVID-19 in the country, according to state-run news agency AZERTAC. (Photo by Tofik Babayev/Xinhua)
