Infectious Diseases Statistics
As part of core public health functions, disease data are collected and maintained by the Infectious Diseases Section of the Connecticut Department of Public Health (DPH). It is important to note that surveillance methods might change over time as needed to reflect how the data will be used. These changes can have an impact on the number of cases and incidence of disease over time. The Infectious Diseases Section monitors over 80 reportable diseases, emergency illnesses, and health conditions that are declared reportable by the Commissioner of the DPH. Surveillance is conducted for many infectious diseases including, for example, vector-borne, foodborne, healthcare associated, vaccine preventable, and sexually transmitted illnesses, as well as, HIV, viral hepatitis, and tuberculosis. Collected data are used by the DPH to identify trends, outbreaks, and changes in infectious agents. Aggregate data of reportable diseases over time can be found below. All documents are in PDF. For other data needs, please contact the appropriate program listed below.
Number of reportable disease cases by county, by year
2020 2019 2018 2017 2016
2015 2014 2013 2012 2011
2010 2009 2008 2007 2006
Number of reportable disease cases by year
2023 2022 2021
2000-2005 1990-1999 1980-1989
Statistics by disease
Chikungunya
Healthcare Associated Infections
Hepatitis B
Hepatitis C
HIV/AIDS
Influenza
Lyme disease
Rabies
STDs
TB
West Nile virus
Zika Virus infection
Outbreak Information
Information on foodborne outbreaks in Connecticut is available through the National Outbreak Reporting System (NORS).
Illness Information
Information on Foodborne Pathogens Active Surveillance Network (FoodNet) is available through FoodNet Fast.
Both databases are maintained by the Centers for Disease Control and Prevention (CDC) and allow you to search by several different variables.
Infectious Disease Programs and Phone Numbers
Epidemiology and Emerging Infections 860-509-7994
Healthcare Associated Infections 860-509-7995
HIV Surveillance 860-509-7900
Immunizations 860-509-7929
Sexually Transmitted Diseases 860-509-7920
TB, HIV, STD and Viral Hepatitis 860-509-7801
Tuberculosis 860-509-7722
For national public health data, please visit the Centers for Disease Control and Prevention website.
This page last updated 01/10/2021.