What are booster shots?

A booster shot is like giving your immune system a second helping of food so it can fight germs even better.

Imagine you're playing a game where you have to catch balls thrown at you. The first time someone throws balls at you, you learn how to catch them. That’s like getting your first vaccine, it helps your body get ready to fight off a germ.

But after a while, the balls start flying faster, and sometimes you miss one or two. That’s like when germs come back, and your immune system might not remember how to fight them as well. A booster shot is like someone throws you another round of balls so you can get better at catching them again.

Sometimes, the first vaccine is enough, but sometimes it helps to have a second chance. Just like how eating your favorite snack again makes you feel even happier, getting a booster shot gives your immune system extra strength to keep fighting germs for longer.