host-associated 8,344 animal host 8,340 digestive tract 8,177 mammalian host 8,024 human host 7,328 intestine 7,204 industrialized 5,422 adult 2,279 infant 2,176 mouth 1,292 urban 822 elderly 815 saliva 790 child 775 rural 425 non-industrialized 381 anthropogenic 365 preterm birth 291 full term birth 254 aquatic 251 terrestrial 246 wastewater 240 sewage 218 built environment 192 adolescent 153 airways 116 skin 108 traditional agriculturalist 57 sludge 39 urogenital tract 34 hospital 26 agriculture 25 medium temperature 21 low temperature 20 hunter-gatherer 19 anaerobic 15 ancient microbiome 15 fermented food 15 food 15 rumen 11 insect host 8 ancient dental calculus 8 cropland 7 plant host 6 soil 5 very low temperature 5 phyllosphere 4 marine 3 dairy product 3 wetland 2 paludal 2 lentic 2 fresh water 1 grassland 1 high temperature 1 low salinity 1 air 1 rhizosphere 1