Immunity is not just a matter of balance, of germs versus our particular micro flora and whether they can cope with invasion on a physical level. Looking at it in this way initially, however, can help us to understand the modern view of the immune system. The immune system is the name given to particular cells and microbes in the blood, lymph, and some organs that defend the body against disease, harmful foreign microbes, and antigens that come into contact with them in the body, or indeed on the skin. The skin is our first line of defense — the…
