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Massachusetts Arbovirus Update

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

Table of Contents

Hard frost

A hard frost has now occurred in all communities across the state. People are no longer at risk of mosquito-borne illness in Massachusetts in 2019.

Routine mosquito testing is typically reported June-October. DPH will conduct early season surveillance activities to assess the risk of WNV and EEE in 2020.

2019 Arbovirus results summary

  Mosquito samples positive Animals positive Humans positive
WNV 87 0 3
EEE 428 9 12
Last updated: November 14, 2019