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Before the U.S. Food and Drug Administration (FDA) determines whether to approve a vaccine or authorize a vaccine for emergency use, clinical trials are conducted to determine how well it works. This is known as effectiveness.After FDA approves a vacci…
Overview of what you should know about the different COVID-19 vaccines, including vaccine types and how they work to provide protection against COVID-19, which vaccines have been authorized and recommended in the United States, and which are in Phase 3…
Understanding How COVID-19 Vaccines Work