How do we know mRNA vaccines are safe and effective? An explainer
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.

Messenger RNA vaccines fueled the response to the worst pandemic the world has faced in a century and led to a Nobel Prize. This week, they’re set to face intense scrutiny from critics doubtful of the safety and efficacy of these shots.
On Wednesday, a subcommittee of the Senate Homeland Security and Governmental Affairs Committee is holding a hearing on, in its own words, “The Corruption of Science and Federal Health Agencies: How Health Officials Downplayed and Hid Myocarditis and Other Adverse Events Associated with the COVID-19 Vaccines.”