Mosquito-borne Diseases in Vermont

Don't let them bug you. Tips for preventing mosquito-borne illness

The mosquitoes return to Vermont in spring, but do not typically pose a health risk until the summer months. By July, some mosquitoes may be carrying West Nile virus (WNV) or Eastern equine encephalitis virus (EEE), and it will be important for Vermonters to take precautions to prevent mosquito bites.

Take precautions to avoid mosquito bites

West Nile Virus / EEE Information Line


West Nile Virus
West Nile virus (WNV) is a mosquito-borne virus that can cause illness ranging from a mild fever to more serious disease. WNV has been found in all counties in Vermont. It was first identified in the United States in 1999 and detected here in 2000.

Eastern Equine Encephalitis
Eastern equine encephalitis (EEE) is a rare but serious viral disease. EEE virus has so far caused illness in only a few areas of Vermont, but it is likely to be found throughout the state. The first two human cases reported occurred in 2012. The disease most commonly affects people and horses, but illness has been reported in other animals including alpacas, llamas, donkeys, pheasants and emus.

Zika Virus
Zika is a virus spread by the bite of certain Aedes species of mosquitoes. Based on what we know now, the mosquitoes that are in Vermont are not likely to transmit Zika virus. Travelers to an area with Zika should talk to their health care provider, and take precautions to avoid mosquito bites. CDC recommends that pregnant women, and women who may become pregnant, should not travel to areas with Zika.

Information Resources and Materials
Fact sheets, brochures, booklets, posters and education materials.

Surveillance and Data
Mosquito surveillance for West Nile virus (WNV) and Eastern equine encephalitis virus (EEE) diseases begins in mid to late June. Find ongoing and historical data, test results, risk assesments and maps, and the Vermont Surveillance and Response Plan.

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