Germs look for ways to get under your skin — literally. They could get in through a cut, ride in on something you ate, filter through the air, or wait on a coin for you to touch it and then rub your eyes.
Once inside, they start to breed. You’re infected, and it can make you feel sick.
Your immune system should know that there’s a problem. It reads a tell-tale “fingerprint” of proteins on the surface of cells, so it can tell the difference between your own cells and what shouldn’t be there.
Your white blood cells aim to destroy the unwelcome guests.
They get their start in your bone marrow. They have a short life — ranging from a few days to a few weeks — so your body constantly makes more. There are different types, and they all have the same goal: to fight infection.
Picture Credit : Google