The main reason why microbes invade the bodies of human beings and animals is because these bodies harbor environments suitable for bacteria to survive and multiply. They provide body fluids, such as plasma rich in sugars, vitamins, minerals, and other substances needed for these micro-organisms to thrive and flourish. Bacteria influence human physiology, alter human thinking, and work together to bioengineer the environment.

It requires a new understanding of the way in which life has developed on Earth and the power micro-organisms such as bacteria and viruses have to regulate and manipulate the global environment and the internal environment of the human beings they inhabit and influence so profoundly.

Strictly by the numbers, the vast majority of bacteria living in our bodies as estimated by many scientists is 90 percent, the cells we think of as our body are actually micro-organisms, not human cells. In fact, most of all life on this planet is composed of bacteria.

The implication of this new understanding is that we need more research, not only on how these micro-organisms become virulent, but also how they withhold their virulence and often moderate or accelerate their attacks.