An elderly woman receives a dose of China's COVID-19 vaccine in Brasilia, Brazil, Jan. 22, 2021. Brazil's Health Regulatory Agency (Anvisa) unanimously approved on Friday the emergency use of another 4.8 million doses of the CoronaVac vaccine against COVID-19. The vaccines were developed by Chinese pharmaceutical firm Sinovac Biotech in partnership with the Butantan Institute. (Photo by Lucio Tavora/Xinhua)