Locations
| Name | Sites | Samples |
|---|---|---|
| Serbia | 4 | 3 |
| Slovakia | 40 | 70 |
| Slovenia | 10 | 38 |
| Spain | 389 | 1382 |
| Sweden | 265 | 1418 |
| Switzerland | 143 | 685 |
| Tanzania | 22 | 191 |
| Turkey | 10 | 80 |
| Turkmenistan | 1 | 2 |
| Uganda | 10 | 63 |
| Ukraine | 100 | 248 |
| Ulster County | 1 | 21 |
| United Kingdom | 1202 | 5372 |
| United States | 12456 | 51041 |
| Uruguay | 9 | 40 |
| Åland Islands | 1 | 9 |