As global COVID-19 cases go on a steep rise, scientists are racing to find an effective coronavirus vaccine. At present, some vaccine candidates have started phase 3 clinical trials, with China contributing to the frontrunners. But, to offer billions a safe and effective vaccine is a challenging task. Limited supply of a potential vaccine will likely be met by overwhelming demand. With these in mind, CGTN talked to world-renowned virologist and immunologist Dr. Gao Fu, director of Chinese Center for Disease Control & Prevention.

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