Infectious disease experts say mRNA vaccines have been studied for decades, they are safe and effective, and were instrumental in saving lives during the COVID pandemic.

This week, mRNA vaccines are set to face intense scrutiny from critics in Congress. Here's an explainer of how we know they are safe and effective.

The mRNA vaccines were developed using novel technology that was approved for the first time for public use during the COVID-19 pandemic.

The FDA plans to limit access to certain high-risk groups and also told Pfizer and Moderna to update their warning labels about heart inflammation.

Late-stage trial data suggest that a new COVID-flu vaccine offers good protection against both infections, but experts expect the shot's approval may be delayed.

Shares of Moderna MRNA declined nearly 8% yesterday after it announced that it had voluntarily withdrawn a regulatory filing seeking the FDA’s approval for mRNA-1083, its investigational mRNA-based combination vaccine against influenza and COVID.

The FDA will encourage new clinical trials on the widely used vaccines before approving them for children and healthy adults. The requirements could cost drugmakers tens of millions of dollars and are likely to leave boosters largely out of reach for hundreds of millions of Americans this fall.

Government signs deal to see huge investment in mRNA vaccine manufacturing which could help tackle the next pandemic and prevent cancers before they develop