Why Do We Need Vaccines If We're Not Sick?
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Ages 5–10 | Why do we need vaccines if we're not sick? You're feeling totally fine, and then it's time for a vaccine.
Wait, why now? Nothing is even wrong.
So why would your body need a vaccine before you're sick?
What is a vaccine actually doing inside you?
And why do you sometimes feel a little different afterwards?
It turns out your body is getting ready ahead of time. But ready for what, exactly?
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