- Rare Encephalitis cause in Northeastern and North Central States
- Tickborne Illness via Woodchuck Tick or Groundhog Tick (Ixodes cookei, I. marxi or I. Scapularis)
- Presentations range from asymptomatic to severe neurologic Impairment
- Antibody to Powassan Virus (serum, CSF)
- See Encephalitis
- No known effective treatment
- Supportive care
- Cognitive Impairment in >50% of survivors, and 10-15% mortality
- Powassan Virus (CDC)