How Do Vaccines Work? | COLOSSAL QUESTIONS



No one likes to get shots, but most of us get them when we're kids in the form of vaccines.

So what are they?

What's in a vaccine, and how do they work?

Let's find out on today's episode of-- Colossal Questions.

Do you know anyone who has polio?

How about smallpox, measles, mumps?

It's unlikely that you do.

That's because these diseases have been all but eliminated by those prickly, pointy shots called vaccines we get as kids.

Take polio, for example.

This infectious disease caused multiple epidemics in the US alone between the late 1800s and the 1940s when a vaccine was more widely available in the country.