COVID-19 vaccine trial underway in the U.S. state of Colorado
CGTN
02:32

Two pharmaceutical companies that are among the leaders in the race to develop coronavirus vaccines have released plans for their drug trials. 

The moves are aimed at providing more transparency about a vaccine process some worry is being rushed ahead of the upcoming U.S. presidential election. 

Part of one trial is now underway in the state of Colorado. Learn more.

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