Fusion - Body Warriors - The Immune System

It might start with a tiny tickle in your throat. Soon, you start to sniffle. You begin to sneeze. Your body feels achy. Oh, no! You are getting sick. Your body is under attack! To fight off this attack of germs, your body has two layers of defence. These two layers protect you from harm. They are always in action. They are your body's warriors. The fight battles inside your body every day. They also fight battles outside your body.