How COVID-19 vaccines work in your body to keep you safe

Learn how COVID-19 vaccines work in the body to keep you and your loved ones safe.

Vaccines give your immune system instructions for how to fight off a virus. So, if you get the real virus later, your immune system finds it and defends itself.

This fact sheet answers common questions about how COVID-19 vaccines work and why we need boosters.

How COVID-19 vaccines work in your body to keep you safe

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