A worker performs a quality check in the packaging facility of Chinese vaccine maker Sinovac Biotech, developing an experimental coronavirus disease (COVID-19) vaccine, during a government-organized media tour in Beijing, China, September 24, 2020. China included Sinovac's vaccine candidate CoronaVac in its emergency use programme launched in July, but late-stage trials overseas have not been completed, arousing safety concerns among experts. REUTERS/Thomas Peter