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


2022-2023 Weekly Influenza Surveillance Report


 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