May 20, 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 Tolland 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.

Yellow Fever

Aedes aegypti


Yellow fever virus is spread to people through the bite of infected mosquitoes. This disease is not spread in the United States and is a very rare cause of illness in travelers. Yellow fever is found in tropical and subtropical areas of Africa and South America. In Connecticut, surveillance is conducted to identify travel-related cases. There is a vaccine to prevent infection with yellow fever virus but there is no medicine to treat it. Yellow fever is on the list of potential bioterrorism pathogens. The best way to prevent getting sick from yellow fever virus is to get vaccinated when traveling to areas at risk for yellow fever virus, and by preventing mosquito bites.


About Yellow Fever


Where Has Yellow Fever Been Found?


Travelers Health

Vaccination Clinics

Prevent Bug Bites


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


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

State Public Health Laboratory Contacts – for additional information


Connecticut Yellow Fever Surveillance

Yellow fever was included on the first list of state-wide reportable diseases in 1990, although data are available since 1980. In Connecticut, surveillance is conducted to identify travel-related cases. There have been no reported cases of Yellow fever to the Connecticut Department of Public Health (DPH).

Connecticut Annual Infectious Diseases Statistics




This page last updated 6/8/2020.