Locations
| Name | Sites | Samples |
|---|---|---|
| Uganda | 10 | 63 |
| Ukraine | 100 | 245 |
| Ulster County | 3 | 24 |
| Union County | 1 | 3 |
| Union County | 1 | 2 |
| Union County | 1 | 6 |
| Union County | 1 | 5 |
| Union County | 3 | 8 |
| Union Parish | 2 | 4 |
| United Kingdom | 1202 | 4687 |
| United States | 18843 | 80855 |
| Upshur County | 12 | 61 |
| Uruguay | 9 | 40 |
| Van Buren County | 2 | 14 |
| Venango County | 3 | 15 |
| Vernon Parish | 9 | 19 |
| Victoria County | 8 | 79 |
| Wabasha County | 1 | 7 |
| Wabaunsee County | 2 | 12 |
| Wake County | 1 | 2 |
| Walker County | 1 | 6 |
| Walsh County | 1 | 1 |
| Walton County | 31 | 78 |
| Walworth County | 1 | 4 |
| Warren County | 2 | 10 |
| Warren County | 1 | 1 |
| Warren County | 1 | 4 |
| Warren County | 4 | 5 |
| Warren County | 2 | 7 |
| Washington County | 1 | 1 |