Moderna's COVID-19 vaccine trial gets underway in the U.S.

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Two large clinical trials of coronavirus vaccines are now underway in the U.S.

This week, pharmaceutical companies Moderna and Pfizer both began advanced clinical trials, involving 30,000 volunteers each.

The trials will help determine if these vaccines are safe and effective.

CGTN's Hendrik Sybrandy looks at the Moderna effort which is being done in partnership with the U.S. government.