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Health Department

Posted on: August 20, 2019

Eastern Equine Encephalitis (EEE)

The Massachusetts Department of Public Health (DPH) announced that laboratory testing confirmed the second case of Eastern Equine Encephalitis (EEE) virus infection, in a male between the ages of 19-30 from eastern Worcester County.  This is the second human case of EEE in Massachusetts this year.  Although there have been no cases of disease here in Northampton, we are urging all Northampton residents and visitors to take necessary precautions to protect themselves and their loved ones against mosquito-borne illnesses.  

EEE is rare but serious and potentially fatal disease that can affect people of all ages.  EEE occurs sporadically in Massachusetts with the most recent outbreak years occurring from 2004-2006 and 2010-2012.  There were 22 human cases of EEE infection during those two outbreak periods with 14 cases occurring among residents of Bristol and Plymouth Counties.  

EEE virus has been found in 288 mosquito samples this year, many of them from species of mosquitoes capable of spreading the virus to people.  

People have an important role to play in protecting themselves and their loved ones from illnesses caused by mosquitoes.

Avoid Mosquito Bites

Apply Insect Repellent when OUtdoors.  Use a repellent with an EPA-registered ingredient )DEET (N, N-diethyl-m-toluamide), permethrin, picaridin (KBR 3023), oil of lemon eucalyptus [p-methane 3,8-diol (PMD)] or IR3535) according to the instructions on the product label.  DEET products should not be used on infants under two months of age and should be used in concentrations of 30% or less on older children.  Oil of lemon eucalyptus should not be used on children under three years of age.  

Be Aware of Peak Mosquito Hours.  The hours from dusk to dawn are peak biting times for many mosquitoes.  Consider rescheduling outdoor activities that occur during evening or early morning in areas of high risk.

Clothing Can Help Reduce Mosquito Bites.  Wearing long-sleeves, long pants and socks when outdoors will help keep mosquitoes away from your skin.

Mosquito-Proof Your Home

Drain Standing Water. Mosquitoes lay their eggs in standing water.  Limit the number of places around your home for mosquitoes to breed by either draining or discarding items that hold water.  Check rain gutters and drains.  Empty any unused flowerpots and wading pools, and change the water in birdbaths frequently.  

Install or Repair Screens.  Keep mosquitoes by having tightly-fitting screens on all of your windows and doors.  

Protect Your Animals

Animal owners should reduce potential mosquito breeding sites on their property by eliminating standing water from containers such as buckets, tires, and wading pools - especially after heavy rains.  Water troughs provide excellent mosquito breeding habitats and should be flushed out at least once a week during the summer months to reduce mosquitoes near paddock areas.  Horse owners should keep horses in indoor stalls at night to reduce their risk of exposure to mosquitoes.  Owners should also speak with their veterinarian about mosquito repellents approved for use in animals and vaccinations to prevent WNV and EEE.  If an animal is suspected of having WNE or EEE, owners are required to report to DAR, Division of Animal Health by calling 617-626-1795 and to the Department of Public Health (DPH) by calling 617-983-6800.

For the most up-to-date information available on spraying locations, visit the Massachusetts Department of Agricultural Resources Aerial Spraying Map https://massnrc.org/spray-map

For other updates, Q&As, and downloadable fact sheets in multiple languages visit the DPH webpage www.ma.gov/guides/aerial-mosquito-control-summer-2019

Information including all West Nile virus and EEE positive results can be found on the Arbovirus Surveillance Information web page or by calling the DPH Epidemiology Program at 617-983-6800.

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