Human Microbiota


The human microbiome refers specifically to the collective genomes of resident microorganisms. The skin and mucous membranes always harbor a variety of microorganisms that can be arranged into two groups: (1) the resident microbiota consists of relatively fixed types of microorganisms regularly found in a given area at a given age; if disturbed, it promptly reestablishes itself; and (2) the transient microbiota consists of nonpathogenic or potentially pathogenic microorganisms that inhabit the skin or mucous membranes for hours, days, or weeks. The transient microbiota is derived from the environment, does not produce disease.