There are millions of bacteria naturally found on and in the human body, called normal flora. Normal skin flora, such as Staph, prevent harmful bacteria and fungi from attaching and colonizing our skin. E. coli, Acidophilus and Bifido are among the normal flora living in our guts to help digest and move food through the intestines.
Not all normal flora are beneficial, however. Some are opportunistic, invading the blood and causing diseases when defenses are down and conditions are right. That’s why the human immune system is constantly producing antibodies to regulate the bacteria in our bodies. You can say it’s a constant battle between light and dark to bring balance to the body system.