mammalian host 146 animal host 146 digestive tract 146 host-associated 146 intestine 146 human host 137 rural 85 non-industrialized 80 adult 62 industrialized 32 child 29 traditional agriculturalist 13 anthropogenic 12 aquatic 6 elderly 6 urban 6 infant 6 wastewater 6 adolescent 5 terrestrial 5 built environment 4 hospital 4 sewage 4 medium temperature 3 food 2 fermented food 2 low temperature 1 hunter-gatherer 1 paludal 1 wetland 1 lentic 1