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Many of them are bacteria of which there are around 1000 species upon human skin from 19 phyla. The total number of bacteria on an average human has been estimated at 10 12 (1 trillion). Most are found in the superficial layers of the epidermis and the upper parts of hair follicles.Skin flora is usually non-pathogenic, and either commensal (are not harmful to their host) or mutualistic (offer a benefit).any of them are bacteria of which there are around 1000 species upon human skin from 19 phyla. The total number of bacteria on an average human has been estimated at 10 12 (1 trillion). Most are found in the superficial layers of the epidermis and the upper parts of hair follicles.
The human microbiota is the aggregate of microorganisms, a microbiome that resides on the surface and in deep layers of skin (including in mammary glands), in the saliva and oral mucosa, in the conjunctiva, and in the gastrointestinal tracts.They include bacteria, fungi, and archaea.here is a point of view that human body contains approximately 1014 bacteria cells, while the number of human cells has been calculated to be at least 3.72 * 10 13. The mass of microorganisms are estimated to account for 1-3% total body mass.