Eastern Equine Encephalitis
Eastern Equine encephalitis virus (EEEV) is spread to people through the bite of infected mosquitoes. EEEV is rare in the United States with an average of 11 cases reported each year. The virus is found in mosquitoes in Connecticut. There is no vaccine to prevent or medicine to treat EEEV infection. Approximately one third of people who become sick from EEEV will die from the illness. Early recognition and prompt supportive treatment can lower the risk of complications and death. The best way to prevent getting sick from EEEV is to prevent mosquito bites.
About Eastern Equine Encephalitis
Data and Maps for Eastern Equine Encephalitis
Connecticut's EEE Response Plan (2020)
Information for Clinicians
Eastern Equine Encephalitis Virus DiseaseCase Definition (2015)
Connecticut Provider Reporting Information
Connecticut Laboratory Reporting Information
EEEV testing at the State Public Health Laboratory
State Public Health Laboratory Contacts – for additional information
Connecticut EEEV Surveillance
In 2000, encephalitis was added to the state-wide reportable disease list, which included Eastern Equine encephalitis (EEE). Since 2013, there have been 5 cases of EEE reported to the Connecticut Department of Public Health. Mosquitoes that can spread EEE are found in Connecticut.
Connecticut Annual Infectious Diseases Statistics
Connecticut Agricultural Experiment Station
The Connecticut Agricultural Experiment Station conducts mosquito trapping and tests for viruses including EEEV during June to October each year.
Mosquito Trapping and Arbovirus Testing Program
Current Mosquito Testing Results
Past-Years Summaries of Mosquito Testing Results
Identification Guide to the Mosquitoes of Connecticut
Mosquito Trapping and Arbovirus Surveillance Program
Additional Resources
Connecticut Mosquito Management Program
Workplace Safety Mosquito-Borne Diseases (NIOSH)
Last updated 1/29/2025