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Micro-organisms are organisms which share the property of being sub-microscopic. They existed long before man and we have had to adapt to live in an environment where they are far more abundant. Many micro-organisms do not normally cause disease in man, existing in a state of either COMMENSALISM, where there is little or no benefit or harm to man, or in MUTUALISM, where there is some benefit gained by both partners. This non-harmful balance exists when the immune system works well, but these same organisms can cause infection when the latter fails

Also, there are 10 time more microbes in our bodies than there are human cells. In addition, there are 500 - 1000 species of bacteria living in the human gut, and about the same number on our skin.
They have colonised EVERY part of the body exposed to the environment - Eyes, Nose, Ears, Mouth, Skin, etc. Some are beneficial, some are harmful, but most are harmless. Quite a large number live in a woman's womanliness, and are harmless, unless the the womanly P.H is disturbed.