Pioneer Valley Mosquito Control District
2025 Arbovirus Updates
Positive Mosquito Samples in Pioneer Valley (See Statewide Results and Risk Maps)
EEE = Eastern Equine Encephalitis virus, WNV = West Nile virus
| Date | County | Town | Species (Positive Pools) | Virus |
|---|---|---|---|---|
| 7/9/2025 | Hampden | Chicopee | Culex pipiens/restuans (1) | WNV |
| 7/14/2025 | Franklin | Leyden | Culex pipiens/restuans (1) | WNV |
| 7/21/2025 | Franklin | Deerfield | Culex pipiens/restuans (1) | WNV |
| 7/21/2025 | Hampshire | Belchertown | Coquillettidia perturbans (1) | EEE |
| 7/24/2025 | Hampden | West Springfield | Culex salinarius (1) | WNV |
| 7/24/2025 | Hampden | East Longmeadow | Culex pipiens/restuans (1) | WNV |
| 7/28/2025 | Franklin | Leyden | Culex pipiens/restuans (1) | WNV |
| 7/28/2025 | Franklin | Rowe | Culex pipiens/restuans (3) | WNV |
| 7/29/2025 | Hampshire | Northampton | Culex pipiens/restuans (1) | WNV |
| 8/3/2025 | Hampden | West Springfield | Culex pipiens/restuans (3) | WNV |
| 8/3/2025 | Hampden | Holyoke | Culex pipiens/restuans (1) | WNV |
| 8/3/2025 | Franklin | Shelburne | Culex pipiens/restuans (1) | WNV |
| 8/3/2025 | Hampshire | Northampton | Culex pipiens/restuans (3) | WNV |
| 8/4/2025 | Franklin | Northfield | Culex pipiens/restuans (1) | WNV |
| 8/12/2025 | Hampshire | Northampton | Culex pipiens/restuans (1) | WNV |
| 8/12/2025 | Hampden | Holyoke | Culex pipiens/restuans (2) | WNV |
| 8/13/2025 | Hampden | East Longmeadow | Culex pipiens/restuans (1) | WNV |
| 8/24/2025 | Hampshire | Amherst | Culex pipiens/restuans (1) | WNV |
| 8/24/2025 | Franklin | Bernardston | Culex pipiens/restuans (1) | WNV |
| 8/25/2025 | Franklin | Deerfield | Culex pipiens/restuans (2) | WNV |
| 8/25/2025 | Hampden | Holyoke | Culex pipiens/restuans (1) | WNV |
| 8/25/2025 | Hampden | West Springfield | Culex pipiens/restuans (2) | WNV |
| 8/25/2025 | Hampden | East Longmeadow | Culex pipiens/restuans (4) | WNV |
| 8/26/2025 | Hampden | Palmer | Culex pipiens/restuans (1) | WNV |
| 9/2/2025 | Franklin | Sunderland | Culex pipiens/restuans (1) | WNV |
| 9/2/2025 | Franklin | Northfield | Culex pipiens/restuans (1) | WNV |
| 9/2/2025 | Franklin | Rowe | Culex pipiens/restuans (1) | WNV |
| 9/2/2025 | Franklin | Shelburne | Culex pipiens/restuans (1) | WNV |
| 9/3/2025 | Hampshire | Granby | Culex pipiens/restuans (6) | WNV |
| 9/3/2025 | Hampshire | South Hadley | Culex pipiens/restuans (2) | WNV |
| 9/3/2025 | Hampden | Palmer | Culex pipiens/restuans (3) | WNV |
| 9/5/2025 | Hampshire | Southampton | Culex pipiens/restuans (1) | WNV |
| 9/5/2025 | Hampden | West Springfield | Culex salinarius (1) | WNV |
| 9/15/2025 | Franklin | Erving | Culex pipiens/restuans (1) | WNV |
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