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Understanding How Vaccines Work

Diseases that vaccines prevent can be dangerous, or even deadly. Vaccines greatly reduce the risk of infection by working with the body’s natural defenses to safely develop immunity to disease. This fact sheet explains how the body fights infection and how vaccines work to protect people by producing immunity.

Author: US Centers for Disease Control and Prevention

Published: 2013

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152 KB PDF (Located at

Resource types: Fact sheet

Diseases/vaccines: Not disease/vaccine specific

Topics: General information

Regions: Global