May 13, 2022: The Centers for Disease Control and Prevention listed six Connecticut Counties in the High/Orange category as part of its COVID-19 Community Levels Map. Only Fairfield and New London Counties are listed in the Medium/Yellow category. Residents in these counties should wear a mask indoors in public; stay up to date with COVID-19 vaccines and get tested if they have symptoms. Additional precautions may be needed for residents who are at high risk for severe illness. Visit the CDC COVID-19 Community Levels Map for updates.

West Nile Virus

Culex pipiens

West Nile virus (WNV) is spread to people through the bite of infected mosquitoes. This disease is the leading cause of mosquito-borne illness across the United States, including in Connecticut. Several mosquito species in Connecticut can carry WNV. The symptoms of WNV infection can range from mild to severe. There is no vaccine to prevent or medicine to treat WNV virus infection. The best way to prevent getting sick from WNV is to prevent mosquito bites.

 

About West Nile Virus

Where in the United States Has WNV Been Found?

ArboNET National Data

 

Information for Clinicians

 

Clinical Guidance

National Surveillance Case Definition

 

Connecticut Provider Reporting Information

Reportable Disease Confidential Case Report form, PD-23

Connecticut Laboratory Reporting Information

Reportable Laboratory Findings form, OL-15C

 

WNV testing at the State Public Health Laboratory

State Public Health Laboratory Contacts – for additional information

 

Connecticut Agricultural Experiment Station

 

In 2000, encephalitis was added to the state-wide reportable disease list, which included West Nile virus (WNV). WNV is a rare disease in Connecticut. Since 2000, an average of 8 cases (range 0 to 23 ) have been reported to the Connecticut Department of Public Health.  

The Connecticut Agricultural Experiment Station conducts mosquito trapping and tests for viruses including West Nile virus 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  

Vector-borne Disease Symposium- Symposium of Mosquito-Borne Disease in Connecticut, held on April 11, 2019.

West Nile Virus and pets and livestock
 

Connecticut WNV Surveillance

 

In 2000, encephalitis was added to the state-wide reportable disease list, which included West Nile virus (WNV). WNV is a rare disease in Connecticut. Since 2000, an average of 8 cases (range 0 to 23 ) have been reported to the Connecticut Department of Public Health.  

Connecticut Annual Infectious Diseases Statistics

Additional Resources

 

Connecticut Mosquito Management Program

Workplace Safety - Mosquito-Borne Diseases   NIOSH  

 

 

 

This page last updated 8/11/2020.