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The FDA's approval was based on a study of 11,400 people age 12 and older that compared the new low-dose vaccine with Moderna's existing vaccine. It found the new vaccine was safe and was at least as effective - and more by some measures - than the original shot, the company said.
The Food and Drug Administration has approved Moderna's new COVID-19 vaccine, days after the federal government tightened vaccine standards for the virus.