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Powassan: Symptoms, Diagnosis, and Treatment | Powassan Virus | CDC Powassan virus infection can result in febrile illness or neurologic disease, including meningitis or encephalitis If you think you or a family member might have Powassan virus disease (Powassan), talk with your healthcare provider
Data and Maps for Powassan | Powassan Virus | CDC Powassan virus disease (Powassan) is a nationally notifiable condition Cases are reported to CDC by state and territorial health departments using standard case definitions
Powassan: Causes and How It Spreads | Powassan Virus | CDC Powassan virus disease (Powassan) is caused by a virus primarily spread to people through the bite of infected ticks Powassan is maintained in the environment between ticks and animals
Clinical Testing and Diagnosis for Powassan Virus Disease Laboratory diagnosis of Powassan virus infection is generally accomplished by testing of serum or cerebrospinal fluid (CSF) to detect Powassan virus-specific IgM and neutralizing antibodies
Treatment and Prevention of Powassan Virus Disease There is no specific treatment for Powassan virus disease; clinical management is supportive Patients with severe meningeal symptoms often require pain control for headaches and antiemetic therapy and rehydration for associated nausea and vomiting
Clinical Signs and Symptoms of Powassan Virus Disease Powassan virus infection can be asymptomatic or cause a non-specific febrile illness Neuroinvasive disease can present as aseptic meningitis or encephalitis which can be severe
Transmission of Powassan Virus | Powassan Virus | CDC Powassan virus is spread to people by the bite of an infected tick Ticks become infected when they feed on groundhogs, squirrels, mice, or other rodents that have the virus in their blood
Current Year Data (2025) | Powassan Virus | CDC View current year data for Powassan ArboNET is a national arboviral surveillance system managed by CDC and state health departments These data are preliminary and subject to change Current season data are updated every one to two weeks during June through December Due to delays in reporting, state, territorial, and local health departments may have more up-to-date information than what is
Preventing Powassan | Powassan Virus | CDC Preventing Powassan Key Points There are no vaccines or medicines to prevent Powassan virus disease (Powassan) The best way to prevent Powassan is to protect yourself from tick bites