Locations
| Name | Sites | Samples |
|---|---|---|
| Paraguay | 2 | 2 |
| Peru | 108 | 290 |
| Poland | 363 | 2154 |
| Portugal | 105 | 250 |
| Ramsey County | 1 | 4 |
| Richland County | 1 | 11 |
| Romania | 104 | 293 |
| Russia | 576 | 1622 |
| Saudi Arabia | 1 | 1 |
| Serbia | 4 | 3 |
| Slovakia | 40 | 70 |
| Slovenia | 10 | 38 |
| Spain | 389 | 1382 |
| Stark County | 2 | 6 |
| Sweden | 265 | 1153 |
| Switzerland | 143 | 678 |
| Tanzania | 22 | 191 |
| Turkey | 10 | 80 |
| Turkmenistan | 1 | 0 |
| Uganda | 10 | 63 |
| Ukraine | 100 | 248 |
| Ulster County | 1 | 21 |
| United Kingdom | 1202 | 4709 |
| United States | 12608 | 51671 |
| Uruguay | 9 | 40 |
| Walsh County | 1 | 1 |
| Åland Islands | 1 | 6 |