What is Immunology?
Cut open a wet fruit and leave it outside. Within a day, it will brown. And within a few weeks, it will be consumed.
So disease is everywhere.
Why are we alive? How do we keep the invaders out?
The answer lies in our immune system.
The challenges it faces are immense. First, it has to be able to defend you against pretty much anything. Viruses and bacteria mutate extremely rapidly, so there is an almost endless variety of things that can attack your body. They each have different characteristics and look like something different.
Protecting our body against this endless onslaught - it's what our immune system does, and what immunology is about.