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Massachusetts Arbovirus Update

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

MDPH has identified five EEE human cases in 2020, residents of Bristol, Hampden, Norfolk and Plymouth Counties. EEE positive mosquito samples have been detected in Franklin, Middlesex, Norfolk, Plymouth, and Worcester Counties, Risk levels have been increased in these regions. Please check back throughout the season to view risk levels and findings of EEE and WNV.

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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

Download: Current EEE and WNV risk level by city/town (Excel)

Arbovirus results summary

  Mosquito samples positive Animals positive Humans positive
WNV 95 0 7
EEE 66 0 5

Additional Resources

Learn about EEE
Learn about WNV
Date published: July 9, 2020
Last updated: September 18, 2020
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