Pennsylvania's Promise for Children’s Post

Different vaccines work in different ways, but every vaccine helps the body’s immune system learn how to fight germs. It typically takes a few weeks for protection to develop after vaccination, but that protection can last a lifetime. A few vaccines, such as those for tetanus or seasonal flu, require occasional booster doses to maintain the body’s defenses. https://ow.ly/rrFx50RmfRX

How Vaccines Work

How Vaccines Work

cdc.gov

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