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What are mRNA vaccines, and how do they work?

Many people first learned about mRNA vaccines during the coronavirus pandemic, when the companies Pfizer-BioNTech and Moderna released their COVID-19 vaccines. The Pfizer-BioNTech shot was the first ...

Why did the U.S. FDA decline to review the new mRNA influenza vaccine?

The FDA declined to review Moderna's mRNA influenza vaccine due to inadequate clinical trial comparators for older adults.