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Understanding How Vaccines Work
www.cdc.govUnderstanding How Vaccines Work The Immune System—The Body’s Defense Against Infection To understand how vaccines work, it helps to first look at how
Understanding How Vaccines Work - Centers for Disease ...
www.cdc.govvaccines work to protect people by producing immunity. The Immune System— The Body’s Defense Against Infection. To understand how vaccines work, it is helpful to irst look at how the body ights illness. When germs, such as bacteria or viruses, invade the body, they attack and multiply. This invasion is called