California serogroup arbovirus

Jamestown Canyon virus

Aedes triseriatus

California serogroup viruses are a group of viruses spread through bites of infected mosquitoes. Jamestown Canyon (JC) virus is the primary virus of this group found in mosquitoes in Connecticut. JC virus disease rarely occurs in people in Connecticut or the United States. There is no vaccine to prevent or medicine to treat JC virus infection. The best way to prevent getting sick from JC virus is to prevent mosquito bites.


About Jamestown Canyon Virus


Jamestown Canyon virus from the 2019 Mosquito-borne Disease Symposium

Where in the United States Has Jamestown Canyon virus (JC) Been Found?

National Arbovirus Data Summary


Information for Clinicians

National Surveillance Case Definitions


Connecticut Provider Reporting Information


Connecticut Laboratory Reporting Information



Directory of Clinical Testing Services provided by the State Public Health Laboratory

State Public Health Laboratory Contacts – for additional information


Connecticut Jamestown Canyon virus Surveillance                   

In 2000, encephalitis was added to the state-wide reportable disease list, which included the California serogroup viruses (CSV). Jamestown Canyon is the most common CSV in mosquitoes in Connecticut. Since 2000, one case of JC virus has been reported to the Connecticut Department of Public Health (DPH).

Connecticut Annual Infectious Diseases Statistics

Additional Resources 

Connecticut Agricultural Experiment Station conducts mosquito trapping and tests for viruses including Jamestown Canyon 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


Connecticut Mosquito Management Program

Mosquito FAQs

Repellents FAQs


Workplace Safety - Mosquito-Borne Diseases   NIOSH




This page last updated 11/4/2022.