How Does a Vaccine Work?

Imagine your body is like a castle. Vaccines are like sending scouts to warn the king about an enemy attack before it happens. The scouts teach the soldiers how to fight, so when the real enemy arrives, they're ready and win the battle.

Why It Works

Vaccines use tiny bits of germs, not enough to make you sick, but just enough to train your body's soldiers (called white blood cells) to recognize and destroy them later.

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Examples

Getting a flu shot is like teaching your body how to fight the flu before it hits you.
A vaccine works like a practice match, your body gets ready for the real game.
When you get a vaccine, you're giving your immune system a heads-up about what's coming.

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Categories: Health · vaccine,immunity,science