Powassan virus disease

Black-legged (Deer) Tick


Powassan virus disease is spread to people through the bite of an infected Black-legged (“deer”) tick (Ixodes scapularis). This is a rare, emerging infection in the United States and human cases have been identified in Connecticut. The virus can cause severe disease. There is no vaccine to prevent or medicine to treat Powassan virus infection. The best way to prevent Powassan virus disease is to prevent tick bites.


About Powassan virus Disease


Information for Clinicians


Clinical Guidance (CDC)

National Surveillance Case Definition


Connecticut Provider Reporting Information

Reportable Disease Confidential Case Report, PD-23

Connecticut Laboratory Reporting Information

Reportable Laboratory Findings form, OL-15C


Directory of Clinical Testing Services provided by the State Public Health Laboratory

State Public Health Laboratory Contacts – for additional information


Tick-borne Diseases of the United States – a Reference Manual for Healthcare Providers


Connecticut Powassan virus disease Surveillance

The Connecticut Department of Public Health (DPH) added Powassan virus disease to the list of state-wide reportable diseases in 2019. DPH uses the Centers for Disease Control and Prevention surveillance case definition, which was established in 2005. Surveillance will help characterize the epidemiology, clinical spectrum, and incidence of Powassan virus disease in Connecticut, and will assist with the national description of the diseases.

Cases of Powassan virus disease reported to the DPH from January 1 – December 31, 2019

4 - Confirmed


Connecticut Annual Infectious Diseases Statistics




This page last updated 1/14/2020.