Populations of commensal bacteria normally present in the intestine, in body orifices, and on the skin.

microorganisms which normally live on the skin without causing disease.

The population of microorganisms (bacteria, viruses, fungi, protozoa) normally resident within an individual host, or within a certain portion of the host (e.g., the intestinal tract).

Flora are microorganisms that live on or within a body to compete with disease-producing microorganisms and provide a natural immunity against certain infections.

in microbiology, the microorganisms present in a given environment; normal flora are those microorganisms which reside harmlessly within the human body.

(n) the beneficial bacteria naturally found in the body that are essential for our health. Examples are lactobacillus acidophilus (the main bacteria in natural yogurt) and bifidobacterium.

Intestinal bacteria; a proper balance of specific bacteria needed for proper maintenance in the bowel.