Table 2.

Variation in pathogen exposures across populations

	USA	Argentina	Philippines	Poland	Bolivia	Namibia	Nepal
	Boston	Qom	Cebu	Rural Polish	Tsimane	Himba	Nubri Tibetan
Routine exposure to livestock			✓	✓		✓	✓
Subsistence Horticulture/Agriculture			✓	✓	✓	✓	✓
Routine hunting of wild animals					✓
Dirt flooring in the home		✓			✓	✓
Lack of indoor plumbing		✓	✓		✓	✓	✓
Limited access to modern, western biomedical care					✓	✓	✓

This table is a visual summary of environmental characteristics that are suspected to contribute to increased pathogen exposure within these populations. No mark indicates the exposure is not present or rare in the population, a gray check mark (✓) indicates the exposure is variably present in the population, and a black check mark (✓) indicates the exposure is widespread in the population.