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's Sinovac Biotech expects to begin analysing final-stage human trial data on its coronavirus vaccine candidate this year to decide whether it is effective enough to seek regulatory approval before trial completion. REUTERS/Thomas Peter