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 continues to be low. See national influenza statistics through Flu View.


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



A snapshot of this week's influenza activity in Connecticut.


Brief information about this week's influenza activity in Connecticut.


Yale EIP logo

FluSurv-NET  Influenza and RSV Surveillance


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.



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


This page last updated 7/23/2021.