Pioneer Valley Mosquito Control District
We’ve Moved! Visit Us at Mass.gov
The Pioneer Valley Mosquito Control District has transitioned its primary online presence to the official Mass.gov website. To get the most up-to-date information regarding our services, meeting schedules, and seasonal operations, please visit us at: https://www.mass.gov/info-details/pioneer-valley-mosquito-control-district.
This site will remain active temporarily but will eventually be decommissioned.
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 |
English