How do germs cause infection?
To cause infection and illness, germs must enter the body in sufficient numbers. They usually do this via the mouth, the nose and in some cases the eyes, because they can’t get through intact skin. Most common infections start when we put hands that have picked up germs to our faces or mouths, or when we eat food that has picked up germs. Some airborne germs, cold or flu viruses from a sneeze for example, can also be breathed in directly.
