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Massachusetts Arbovirus Update

Current Eastern Equine Encephalitis (EEE) and West Nile Virus (WNV) information in Massachusetts

MDPH has identified seven WNV human cases in Bristol, Essex and Middlesex Counties. WNV positive mosquito samples have been identified in Barnstable, Berkshire, Bristol, Essex, Franklin, Hampden, Hampshire, Middlesex, Norfolk, Plymouth, Suffolk, and Worcester Counties.

WNV risk levels have increased to High for communities in Essex, Middlesex, Norfolk and Suffolk Counties due to increasing WNV activity. Please view the risk maps for updates. Take steps to reduce your risk by using EPA approved repellents and avoiding mosquitoes at dusk and dawn. Please check back throughout the season to view risk levels and detections of EEE and WNV.

Table of Contents

EEE risk map

If you are on a mobile device, you can Link to the Mobile View of the EEE Risk Map.

What does your city or town's EEE risk level mean? View the Key to Color Coding on EEE Risk Map | (Accessible version)

WNV risk map

If you are on a mobile device, you can Link to Mobile View of the WNV Risk Map.

What does your city or town's WNV risk level mean? View the Key to Color Coding on WNV Risk Map | (Accessible version)

EEE and WNV risk level by city/town

Arbovirus results summary

Additional Resources

Last updated: September 24, 2021
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