host-associated 2,163 animal host 2,117 mammalian host 2,040 human host 2,002 industrialized 1,748 terrestrial 1,697 anthropogenic 1,559 built environment 1,445 skin 1,416 adult 856 digestive tract 681 elderly 546 intestine 446 infant 307 mouth 273 aquatic 255 hospital 222 soil 206 preterm birth 178 saliva 157 urban 156 wastewater 116 sludge 101 fresh water 51 marine 47 plant host 46 child 44 airways 43 rhizosphere 38 agriculture 32 forest 30 medium temperature 27 subsurface 27 low salinity 27 very low temperature 26 groundwater 25 lentic 24 tundra 23 pelagic 22 low temperature 20 sewage 18 arid 18 contaminated 18 paludal 16 wetland 16 grassland 16 lacustrine 16 medium salinity 16 brackish water 15 high salinity 15 full term birth 15 estuary 14 permafrost 13 cropland 12 benthic 12 sediment 11 ice 11 anaerobic 10 urogenital tract 10 stream 10 adolescent 9 rural 8 lake bed 8 littoral 6 phyllosphere 6 insect host 6 mine 4 negative control 3 non-industrialized 3 food 2 lotic 2 very high salinity 2 plant litter 2 fermented food 2 briny water 2 alkaline 1 acidic 1 sea floor 1 hydrothermal vent 1 spring 1 ancient microbiome 1 ancient dental calculus 1 traditional agriculturalist 1 fluvial 1 very high temperature 1