How does the human immune system protect against disease?

The human immune system is like a superhero team that fights off bad guys who try to make you sick.

Your body is like a castle, and germs are like sneaky little thieves trying to break in. The immune system is the guard and the warrior that stops them from taking over your castle.

Imagine you're playing with your toys when someone knocks on the door, that's like a germ coming to visit. Your white blood cells are like brave knights who jump into action. Some of them grab the germs and swallow them whole, while others send out messages to call more help.

Sometimes, the germs are tricky and try to hide. But your immune system has special fighters called antibodies, like tiny nets that catch the germs so they can't run away.

After a few battles, your body gets better at fighting those same germs, it's like learning how to beat up the same bully every day. That’s why you might get sick once, but then you don’t for a while after that!