| County | City | Onset Date | Virus | Species |
|---|---|---|---|---|
| Bristol | Norton | 08/11/2019 | EEE | Goat |
| Worcester | Mendon | 08/16/2019 | EEE | Horse |
| Worcester | Uxbridge | 08/22/2019 | EEE | Horse |
| Essex | Methuen | 08/22/2019 | EEE | Horse |
| Norfolk | Medfield | 08/24/2019 | EEE | Horse |
| Middlesex | Holliston | 08/23/2019 | EEE | Horse |
| Worcester | Brookfield | 08/27/2019 | EEE | Horse |
| Worcester | Douglas | 08/23/2019 | EEE | Horse |
| Worcester | Spencer | 09/27/2019 | EEE | Horse |