| Barnstable | Bourne | 2017-08-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Barnstable | Sandwich | 2017-08-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Berkshire | Richmond | 6/27/2017 | Culex pipiens/restuans complex | WNV |
| Berkshire | Pittsfield | 7/25/2017 | Culex pipiens/restuans complex | WNV |
| Berkshire | Clarksburg | 7/27/2017 | Culex pipiens/restuans complex | WNV |
| Berkshire | Pittsfield | 2017-03-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Berkshire | Pittsfield | 2017-03-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Berkshire | Sheffield | 2017-03-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Bristol | Fairhaven | 2017-06-07 00:00:00 | Culex pipiens/restuans complex | WNV |
| Bristol | Seekonk | 2017-03-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Bristol | Swansea | 2017-03-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Essex | Haverhill | 7/18/2017 | Culex pipiens/restuans complex | WNV |
| Essex | Lynn | 7/24/2017 | Culex pipiens/restuans complex | WNV |
| Essex | Lynn | 7/31/2017 | Culex pipiens | WNV |
| Essex | Lynn | 7/31/2017 | Culex pipiens | WNV |
| Franklin | Greenfield | 7/17/2017 | Culex pipiens/restuans complex | WNV |
| Franklin | Deerfield | 7/31/2017 | Culex pipiens/restuans complex | WNV |
| Franklin | Deerfield | 7/31/2017 | Culex pipiens/restuans complex | WNV |
| Hampden | East Longmeadow | 7/17/2017 | Culex species | WNV |
| Hampden | East Longmeadow | 7/24/2017 | Culex species | WNV |
| Hampden | Holyoke | 2017-02-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Hampden | Holyoke | 2017-02-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Hampshire | Northampton | 7/31/2017 | Culex pipiens/restuans complex | WNV |
| Hampshire | Northampton | 7/31/2017 | Culex pipiens/restuans complex | WNV |
| Middlesex | Belmont | 2017-11-07 00:00:00 | Culex pipiens/restuans complex | WNV |
| Middlesex | Cambridge | 2017-11-07 00:00:00 | Culex pipiens/restuans complex | WNV |
| Middlesex | Everett | 7/18/2017 | Culex pipiens/restuans complex | WNV |
| Middlesex | Everett | 7/18/2017 | Culex pipiens/restuans complex | WNV |
| Middlesex | Everett | 7/18/2017 | Culex pipiens/restuans complex | WNV |
| Middlesex | Malden | 7/18/2017 | Culex pipiens/restuans complex | WNV |
| Middlesex | Medford | 7/18/2017 | Culex pipiens/restuans complex | WNV |
| Middlesex | Medford | 7/18/2017 | Culex pipiens/restuans complex | WNV |
| Middlesex | Medford | 7/18/2017 | Culex pipiens/restuans complex | WNV |
| Middlesex | Ashland | 7/27/2017 | Culex species | WNV |
| Middlesex | Melrose | 7/26/2017 | Culex pipiens/restuans complex | WNV |
| Middlesex | Lexington | 2017-01-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Middlesex | Lexington | 2017-01-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Middlesex | Chelmsford | 2017-01-08 00:00:00 | Culex species | WNV |
| Middlesex | Concord | 2017-03-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Middlesex | Newton | 2017-08-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Middlesex | Newton | 2017-08-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Norfolk | Brookline | 7/19/2017 | Culex pipiens/restuans complex | WNV |
| Norfolk | Needham | 2017-01-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Plymouth | Abington | 2017-11-07 00:00:00 | Culex pipiens/restuans complex | WNV |
| Plymouth | Marion | 7/18/2017 | Culex pipiens/restuans complex | WNV |
| Plymouth | West Bridgewater | 2017-01-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Plymouth | Whitman | 2017-01-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Suffolk | Boston | 6/29/2017 | Culex pipiens/restuans complex | WNV |
| Suffolk | Boston | 2017-12-07 00:00:00 | Culex pipiens/restuans complex | WNV |
| Suffolk | Winthrop | 7/17/2017 | Culex pipiens/restuans complex | WNV |
| Suffolk | Boston | 7/18/2017 | Culex pipiens/restuans complex | WNV |
| Suffolk | Boston | 7/26/2017 | Culex pipiens/restuans complex | WNV |
| Suffolk | Boston | 2017-01-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Worcester | Worcester | 7/20/2017 | Culex pipiens/restuans complex | WNV |
| Worcester | Worcester | 7/20/2017 | Culex pipiens/restuans complex | WNV |
| Worcester | Worcester | 7/20/2017 | Culex pipiens/restuans complex | WNV |
| Worcester | Milford | 7/27/2017 | Culex species | WNV |
| Worcester | Grafton | 2017-02-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Worcester | Worcester | 2017-02-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Worcester | Worcester | 2017-02-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Worcester | Worcester | 2017-02-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Worcester | Worcester | 2017-02-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Worcester | Worcester | 2017-02-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Worcester | Worcester | 2017-02-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Worcester | Worcester | 2017-02-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Worcester | Worcester | 2017-02-08 00:00:00 | Culex pipiens/restuans complex | WNV |
| Worcester | Worcester | 2017-02-08 00:00:00 | Culex pipiens/restuans complex | WNV |