Lyme Disease

Tick on grass.
Lyme disease is an important health concern in Connecticut. Since it was first recognized in the Lyme, Connecticut area in 1975, the Department of Public Health (DPH) has contributed to the understanding of this complex disease, as well as other tick-borne diseases. 

On average since 1998, the DPH has reported about 3,000 cases annually to the Centers for Disease Control and Prevention (CDC). Recently, the CDC estimated that there are approximately 10 times more people diagnosed with Lyme disease than the yearly reported number. Using the CDC estimate, approximately 30,000 people are diagnosed with Lyme disease each year in Connecticut.

The reported incidence, which sets the trend for Lyme disease over time, is due to many changing factors that include:
  • Weather
  • Tick abundance, habitat, and infectivity rates 
  • Deer population and habitat 
  • Recognition of the disease by those infected and health care practitioners
  • Living in a wooded area
  • Potential for contact with ticks, including recreational activities 
  • Disease reporting by the healthcare provider


Learn More About Lyme Disease

Diagnosis and Testing


Protect Your Pet

Signs and Symptoms




The Role of Deer


Quick Links

Connecticut's Lyme disease history

How to establish a local health tick-borne diseases community intervention program (2008)

Lyme Disease Statistics

Other tick-borne diseases in Connecticut





Additional Resources

Notice: You are about to leave the Connecticut Department of Public Health (DPH)website. We have provided links to these sites because they have information that may be of interest to you. The DPH does not necessarily endorse the views or information presented on these sites. Furthermore, the DPH does not endorse any commercial products or information that may be presented or advertised on the site that is about to be displayed.

Finding Good Health Information on the Internet

Northeast Regional Center for Excellence in Vector-Borne Diseases

Vector-borne Disease Symposium  -  Presentation recordings of symposium held at the Connecticut Agricultural Experiment Station on May 20, 2016.
Here's a good place to start: NIH Medline Plus - Lyme Disease
New York State Department of Health Lyme Disease and Other Diseases Carried by Ticks




To contact the Epidemiology and Emerging Infections Program, please call 860-509-7994.