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A judge's gavel resting on a pile of one-dollar bills

How Does the COVID Vaccine Work?

Most COVID-19 vaccines require more than one dose to be effective, the Centers for Disease Control and Prevention saiys.

A judge's gavel resting on a pile of one-dollar bills

How Effective Is the COVID Vaccine?

The U.S. Centers for Disease Control and Prevention is working with other federal agencies to assess COVID-19 vaccine effectiveness in real-life settings.