Connecticut Seasonal Influenza Statistics



In Connecticut, the Department of Public Health 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.


This Week's Complete Flu Update




 This year's flu season data collection begins with Week 35; August 25, 2019.

A snapshot of this week's flu activity in Connecticut. Brief information about this week's flu activity in Connecticut. 


Weekly Influenza Reports

Annual Influenza Seasonal Summaries

National influenza statistics through Flu View.

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 3/12/2020.