When tiny villains called germs enter our body, they start to multiply and cause an infection.

As these invaders spread, they can create a nasty yellow or green liquid called pus. Our army (immune system) fights against the germs to chase them away. Sometimes, this battle can make you feel tired or give you a fever.

To help kick the germs out faster, doctors may give you special medicines called antibiotics. Then all you need to do is rest and let your body do its job.