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FDA panel considers a first-of-its-kind flu vaccine using mRNA technology

The panel cited strong trial results and no major safety concerns, with Moderna saying the shot cut flu cases by 26.6% in 40,805 adults.

  • On Thursday, U.S. health advisers are debating Moderna's mFlusiva, the first mRNA flu vaccine, as the FDA advisory committee moves toward a final approval decision ahead of the winter flu season.
  • Earlier this year, then-top FDA official Dr. Vinay Prasad blocked Moderna's application, citing concerns the shot should have compared to high-dose senior vaccines under Health Secretary Robert F. Kennedy Jr.'s heightened scrutiny. Days after the dispute, the FDA accepted the application.
  • In a 40,000-person study of people age 50 and older, Moderna's vaccine reduced flu cases by about 27% compared to standard vaccines. The FDA published a favorable review ahead of the meeting, reporting no safety concerns.
  • Moderna seeks full approval for the 50- to 64-year-old population and authorization for those 65 and older while conducting additional testing. The FDA's review noted the vaccine lacks data on very frail older adults and those with weak immune systems.
  • Tens of thousands of Americans die from influenza annually, with older adults among the most vulnerable. Vaccines using Nobel Prize-winning mRNA technology manufacture faster than conventional types, potentially enabling rapid response if the shape-shifting flu virus mutates.
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Reuters broke the news in New York, United States on Tuesday, June 16, 2026.
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