EEE and Mosquito Updates - Fall 2019

Latest Update:

Avoid Swamps and Wetlands Until First Hard Frost of Season - 10/3/2019

ATTENTION Hunters, Anglers, and Hikers:

Residents, especially those in the southeastern part of the state from the lower Connecticut River Valley to the Rhode Island border, are advised to protect themselves and their children by taking personal precautions to prevent mosquito bites until the first hard frost of the fall. 

While the recent drop in temperatures are not yet cold enough to kill mosquitoes, they will be successful in driving mosquitoes back into the swamps and wetlands where they live, and prefer to be.  These areas are often where people go to hunt, hike, or fish, and may take their kids to learn and enjoy these activities.  If you are going to spend time near swamps or wetlands for hiking, fishing, or other outdoor activities, please take precautions to protect yourself and your children from mosquito bites.  The Glastonbury Health Department is advising residents to wear long sleeves and pants when outdoors, as well as mosquito repellent and to ultimately avoid swamps and wetlands as much as possible until the first hard frost of the season.  Consideration should also be given to minimizing outdoor activity from dusk to dawn, when mosquitoes are most active. The Department of Public Health announced on Oct. 1, 2019 that a third person has died this year in CT from Eastern Equine Encephalitis (EEE) and a fourth person remains hospitalized due to EEE (Click here to view the press release for more details).

For more information, including weekly surveillance updates of mosquito and virus activity, precautionary and control methods, and the current list of certified applicators, please visit

EEE / Mosquito Update from Glastonbury Health Department - 9/24/2019

Connecticut and other New England States are experiencing an active season for Eastern Equine Encephalitis (EEE).  While Connecticut has reported two human cases of EEE this year, including a recent death, Glastonbury has not identified any disease-causing mosquitoes to date.  The Town has a mosquito trapping station on Tryon Street that is monitored regularly during the mosquito season. Mosquitoes will continue to be tested and updates made available to the public as applicable.

EEE is a rare disease caused by a virus spread through the bite of an infected mosquito.  EEE virus is one of a group of mosquito-transmitted viruses that can cause inflammation of the brain (encephalitis).  Disease transmission does not occur directly from person to person.  In the United States, approximately 5-10 EEE cases are reported annually. 

Persons over the age of 50 and younger than age 15 are at greatest risk of severe disease (encephalitis) following infection.  It takes 4 to 10 days after the bite of an infected mosquito to develop symptoms of EEE.  There is no specific treatment for EEE. Antibiotics are not effective against viruses, and no effective anti-viral drugs have been discovered.  Pesticide spraying to kill adult mosquitos is unlikely to be effective at this time of year when it is cooler at night and mosquitos are less active.  

Preventing Mosquito Bites and Infection

The most effective way to prevent infection from Eastern Equine Encephalitis virus, or other mosquito-borne illness, is to prevent mosquito bites. Use insect repellent, wear long-sleeved shirts and pants, treat clothing and gear, and take steps to control mosquitoes indoors and outdoors.  Always follow the product label instructions when using insect repellent. 

Visiting an area where virus activity has been identified increases the risk of infection with EEE, especially to persons who engage in outdoor work and recreational activities in these areas.  Residents are advised against unnecessary trips to mosquito breeding grounds and marshes as the mosquitoes that transmit EEE virus are associated with freshwater swamps and are most active at dusk and dawn.  Overnight camping or other extended outdoor exposure in freshwater swamps should also be avoided.  Despite the cooler, fall temperatures that have started to work their way into the season, mosquitoes continue to be active until the first heavy frost and residents should continue to take measures to prevent mosquito bites.

Horses, llamas, and alpacas are also known to be susceptible to EEE.  Additionally, emus, ostriches, and some game birds (e.g. pheasants and quail) are susceptible to EEE as well.  There is an approved vaccine for use in horses, which should be discussed with your veterinarian.  Insect repellents recommended for humans are not approved for use on your pets.  Talk with your veterinarian for advice about the appropriate product for use on your pet.


To view updates on mosquitoes and EEE in New England, please click on the web resources below:

CDC Mosquito Bite Prevention reference guide

State of CT Mosquito-Testing Web Page

DPH announces increased risk of disease from mosquitoes - 9/12/2019

Yesterday, the State Department of Public Health (DPH) distributed an updated press release regarding increased risk of disease from mosquitoes.  View the state DPH September 11, 2019 Press Release here.

As our warm weather continues into autumn, mosquito activity remains heavy in Connecticut.  West Nile Virus has been identified in mosquitoes in several nearby towns, including Wethersfield, Hartford, West Hartford, South Windsor, and Manchester.  Eastern Equine Encephalitis has been identified in horses in Columbia and Colchester. 

In addition to precautions taken at home, residents should also avoid mosquito bites during late afternoon and evening activities, including at local fairs and other seasonal outdoors events.

For more information, please visit


Mosquito Precautions for residents – 9/4/2019

EEE virus detected in 7 southeastern CT towns

The Connecticut Department of Public Health (DPH) recently issued a press release advising CT residents to take caution and protect themselves from mosquito bites to reduce the risk of contracting eastern equine encephalitis (EEE).  While 7 southeastern CT towns have trapped mosquitoes testing positively for this virus, Glastonbury is NOT yet among them.  Glastonbury has a mosquito trapping station, which allows state officials to collect and test mosquitoes right here in town.  As of 9/4/19, there have been NO mosquitoes trapped in Glastonbury that were positive for either West Nile Virus or Eastern Equine encephalitis. The trapping station will be monitored until mosquito season is over - typically in October, pending weather temperatures. 

Although mosquitoes carrying the virus have not yet been trapped here in town, the Glastonbury Health Department is still advising residents to take precautions against mosquitoes.  The following actions can help reduce the likelihood of mosquito bites:

  • Use insect repellent
  • Wear long-sleeved shirts and pant
  • Treat clothing and gear
  • Check your property for areas of standing water which may invite mosquito breeding and remove them where applicable/possible

For more information on preventing mosquito bites and mosquito virus activity in our state, please visit the following web pages:

Center for Disease Control Mosquito Prevention Reference Guide

CT DPH West Nile Virus Activity Map

CT DPH Eastern Quine Encephalitis (EEE) Activity Map


Mosquito Control for Homeowners  

Avoid Mosquito Bites

  1. Mosquitoes are most active in the evening and early morning hours.
  2. Avoid shaded, humid areas with little or no breeze.
  3. Avoid tall grasses/weeds.
  4. Wear light-colored, loose fitting clothing--long sleeves and long pants.
  5. Use appropriate chemical repellents. Those containing one of the following work best.
    • DEET
    • Picaridin
    • Oil of lemon eucalyptus 

Eliminate Breeding Sites

Potential Breeding Sites Examples Solution
Swimming Pools Abandoned Properly fill or tear down.
Active Maintain sanitizers and filters
Wading/children Empty after each use and store upside down
Containers Old tires, pet bowls, buckets, flower pot saucers, bottles, cans, tire swings, garbage cans/lids, rain barrels/basins Keep empty, remove or cover
Any area where water can collect in a stagnant situation Ditches Clear debris and keep drained.
Low areas/ruts Fill with dirt and reseed.
Bird baths Empty frequently.
Fountains Maintain water circulation
Ornamental water garden Stock with mosquito-eating fish
Ponds, creeks, lakes Minimize plant growth and maintain water circulation
Boats Store covered or upside down.
Leaking water spigots Repair leaks, maintain spigots.
Clogged gutters Clean and maintain regularly
Tree rot holes, hollow stumps Fill hole or remove tree/stump.
Catch basins Use mosquito dunks.