EEE Threat Level Raised in Massachusetts Following First Fatality


The total number of communities at critical risk of the mosquito-borne Eastern equine encephalitis stands at 28 statewide. Thirty-seven other towns are considered at high risk for EEE, while 126 are at moderate risk.

Public health officials have raised the risk level for Eastern equine encephalitis (EEE) to critical in 4 Massachusetts towns where the mosquito-borne virus was detected in 4 horses. The new distinction also comes after the first human EEE fatality of the year was reported earlier this week.

According to a statement from the Massachusetts Department of Public Health (DPH), the EEE threat level now stands at critical in Holliston, Medfield, Brookfield, and Granby, putting the total number of critical communities at 28 statewide. Thirty-seven other towns are considered at high risk for EEE, while 126 are at moderate risk.

“As we head into the Labor Day weekend and the month of September people should not forget to bring and use an EPA-approved mosquito repellent for any outdoor activities,” Public Health Commissioner Monica Bharel, MD, MPH, said in the statement. “The peak time for transmission of mosquito-borne illness extends through September here in Massachusetts.”

A total of 4 human cases of EEE have been reported in Massachusetts so far this year, stemming from 7 equine cases. One fatality was reported in a Fairhaven woman who contracted the infection, The Boston Herald reported.

Without a specific antiviral treatment or vaccine to prevent infection, EEE proves fatal in 30% of cases, according to the US Centers for Disease Control and Prevention (CDC). Survivors often suffer ongoing neurological problems.

According to DPH, EEE occurs periodically in the state, with the most recent outbreaks reported from 2004-2006 and 2010-2012. During those 2 outbreak periods, there were 22 human cases of EEE infection.

Aerial mosquito spraying operations have been completed in Bristol, Plymouth, Middlesex, and Worcester counties as of this week.

“It remains critically important for people in communities at critical, high, and moderate risk for EEE to continue to take personal precautions against mosquito bites,” DHS said in a statement. “These steps include using EPA-approved bug spray, wearing long sleeves and pants outdoors to reduce exposed skin, and cancelling outdoor activities in the hours from dusk to dawn when mosquitoes are most active.”

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