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Microbial niches and their environmental characteristics across the human body. Niche conditions for nasal (56–58), oral (51, 59–61), skin (51, 62, 63), gastrointestinal (51, 64, 65), urinary tract (66–69), and vaginal (70, 71) sites are summarized. Abbreviations: Temp, temperature; O2, oxygen tension (sea-level average = 760 mm Hg); MD, microbial density (reported in relevant units). This figure was created with Biorender.
