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. 2021 Jan 13;15(1):295–301. doi: 10.1016/j.dsx.2020.12.040

Table 1.

Main bacterial composition of the human microbiota in the various body areas. It is noted that the Bacteroides are present in airways, mouth and gastrointestinal tract, instead Firmicutes is present in all.


Prevailing Bacteria
Body sites Phyla
Skin Actinobacteria, Firmicutes, Proteobacteria
Oral Bacteroides,Firmicutes,Fusobacteria,Proteobacteria
Airways Bacteroides, Firmicutes, Proteobacteria
Gastrointestinal Bacteroides, Firmicutes, Actinobacteria
Urogenital Firmicutes