COVID-19 Community Levels Map Update, September 30, 2022:The Centers for Disease Control and Prevention has listed New Haven, Fairfield, Litchfield, Middlesex, Hartford, Tolland, and Windham Counties in the Medium/Yellow category as part of its COVID-19 Community Levels Map. New London County is listed in the Low/Green categories. Visit the CDC COVID-19 Community Levels Map for updates.

Monkeypox: Please visit our monkeypox webpage for the latest updates.

Connecticut Seasonal Influenza Statistics

Influenza (flu) is a respiratory illness caused by influenza viruses. This contagious disease can cause mild to severe symptoms that may require hospitalization. Certain health conditions (asthma, diabetes, heart disease, etc.) can result in a higher risk of getting sick with influenza. Age may also play a role in who gets sick and has more severe symptoms. To learn about how to prevent getting sick with influenza, visit the Centers for Disease Control and Prevention.


In Connecticut, the DPH uses multiple surveillance systems to monitor circulating influenza viruses. Seasonal flu viruses can be detected throughout the year; however, seasonal flu activity generally begins as early as October and November and can continue through late May. The weekly surveillance reports show how this year's flu season is developing. Each report is progressive and includes data starting from the beginning of this flu season.


Statewide influenza activity is increasing. See national influenza statistics through Flu View.


A type of influenza affecting birds, known as Highly Pathogenic Avian Influenza (HPAI), has been found in wild birds in several Connecticut counties and in a small farm in Connecticut, see HPAI in CT. These viruses pose little risk to people although the CDC has now identified a human case in Colorado, see U.S. Case of Human Avian Influenza Reported.


Testing and treatment of influenza when SARS-CoV-2 and influenza viruses are co-circulating


Connecticut COVID-19 Data


CDC Flu View

This week's influenza update


This season's weekly reports





Influenza Geographic Activity classification

The estimated level of geographic spread of influenza activity is determined weekly. Although this level does not measure the severity of influenza illness, it does show the impact of influenza on the public and healthcare centers.

Geographic spread of influenza activity is reported as:  

Geographic Activity Classification

 Yale EIP logo

FluSurv-NET  Influenza and RSV Surveillance

Last weekly influenza update for the 2020-2021 season


Last weekly influenza update for the 2019-2020 season


Annual Influenza Seasonal Summaries


International influenza activity is available through the World Health Organization.


Get a flu vaccine to help prevent severe illness.

This page last updated 07/01/2022