Harvard Health Tips

How vaccines work

Vaccines mimic what would happen naturally when a potentially harmful bacterium or virus breaches the body?s defenses, but with one essential difference ? there?s no harmful germ involved. Instead, the vaccine contains a recognizable but harmless version of the germ. When you?re vaccinated, your innate immune system is fooled into thinking that the germ has gotten in and mounts a response to fight it.…

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