COVID-19 vaccine front-runners: How soon? How potent?

Researchers around the world are racing against the clock to develop a COVID-19 vaccine with more than 170 candidates now tracked by the World Health Organization. Among those, the promising ones are reportedly from the UK, the U.S., China and Russia, with large-scale human trials underway in different parts of the world. With the virus still mutating rapidly, will there ever be an effective vaccine and how much longer do we have to wait? #COVID19 #vaccine

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Видео COVID-19 vaccine front-runners: How soon? How potent? канала CGTN