photo of mosquito

West Nile Virus (WNV) and Eastern Equine Encephalitis (EEE or “Triple E”) are viruses that can cause illness ranging from a mild fever to more serious disease like encephalitis or meningitis. They are spread to people through the bite of an infected mosquito. There are no specific treatments for either virus, but steps can be taken to protect yourself from illness, including:

  • Using insect repellents
  • Wearing long-sleeved clothing
  • Scheduling outdoor activities to avoid the hours around dawn and dusk
  • Repairing damaged window screens
  • Removing standing water from the areas around your home

General Information and FAQs

Find basic information on mosquitoes in Massachusetts and the diseases they can carry.

Prevention and Control

Protect yourself from mosquitoes with these prevention methods.

Surveillance Plan, Summaries and Data

Information on surveillance for mosquito-borne disease in Massachusetts and annual surveillance summaries with data.

For Health Care Providers and Veterinarians

Clinical and specimen submission information.

Travel-related Mosquito-borne Diseases

Learn more about Zika virus, Dengue fever, Chikungunya and other mosquito-borne diseases you can get when traveling abroad.

Educational Materials

Downloadable educational tools to help raise awareness.

Helpful Links and Additional Resources

Links to external sites with more information.


This information is provided by Epidemiology Program within the Department of Public Health.