Massachusetts arbovirus update

Find local risk levels for Eastern Equine Encephalitis (EEE) and West Nile Virus (WNV) based on seasonal testing.

Massachusetts Department of Public Health tests for EEE and WNV from June to October. Please check back during the testing season to view local risk levels and daily case data. You can find data from previous years here.

Risk maps

If you are having difficulty viewing the dashboard on a mobile or tablet device, you can try this link to the online dashboard.

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What does your city or town's EEE or WNV risk level mean? View the keys:

• Key to Color Coding on EEE Risk Map | (Accessible version)
• Key to Color Coding on WNV Risk Map | (Accessible version)

EEE and WNV risk level by city/town

Download:

2024 EEE and WNV risk level and data (Excel)

Archived:

2023 EEE and WNV risk level and data – Final (Excel)

2022 EEE and WNV risk level and data (Excel)