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.

The US Food and Drug Administration will now require Covid-19 vaccines from Pfizer/BioNTech and Moderna to use expanded warning labels with more information about the risk of a rare heart condition after vaccination.

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 most commonly reported adverse events with the AZD1222 COVID-19 vaccine are headache and fatigue, a large-scale active surveillance study from the United Kingdom shows.

Dr. Peter McCullough testified Thursday at a Senate hearing on "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.

The FDA’s recent activities regarding Covid-19 vaccines stray far from the well-established standards of vaccine regulatory processes.

No, this is not true. Vaccines undergo rigorous safety testing and are continuously monitored for adverse events.

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.