Being germ free
First line body defences
- Healthy, unbroken skin blocks many pathogens.
- Mucus blocks some pathogens from entering through the mouth and nose.
- Cilia traps the pathogens for you to sneeze out.
Second line body defences
- Acids in the stomach can kill pathogens.
- A fever can kill some pathogens.
- White blood cells fight pathogens. Some form antibodies that kills certain antigens.