Arboviral diseases, Powassan virus disease

Imported from NNDSS: Arboviral diseases, Powassan virus disease

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What is Arboviral diseases, Powassan virus disease?

The Powassan virus was first identified in 1958 in Powassan, Ontario, Canada, from the brain of a young boy who died of encephalitis. It was the first tick-borne flavivirus recognized in North America. Since its discovery, cases have been reported predominantly in the Great Lakes region and northeastern U.S., and southeastern Canada.

Symptoms

  • Early/Mild Symptoms (if present): Fever, headache, vomiting, weakness.
  • Severe Neurological Symptoms (Meningitis/Encephalitis): Confusion, disorientation, seizures, speech difficulties, paralysis, profound weakness. These can appear 1-4 weeks after a tick bite.

Transmission

Powassan virus is transmitted to humans through the bite of infected ticks. The primary vectors are the blacklegged tick (*Ixodes scapularis*), also known as the deer tick, and the groundhog or woodchuck tick (*Ixodes cookei*). The virus can be transmitted relatively quickly, sometimes within 15 minutes of an infected tick attaching, unlike Lyme disease which typically requires longer attachment times.

Contagious Period: Varies by disease

Prevention

  • Avoid Tick Bites: Use insect repellents containing DEET or picaridin on exposed skin and clothing.
  • Protective Clothing: Wear long-sleeved shirts and long pants when in wooded or grassy areas.
  • Tick Checks: Perform thorough tick checks on yourself, children, and pets after spending time outdoors.
  • Tick Removal: Remove attached ticks promptly and correctly.
  • No Vaccine: Currently, no vaccine is available for humans.

Active Outbreaks & Recent Cases

Real-time intelligence from global health monitoring and AI-powered surveillance

Data sources: BEACON, ProMED, WHO, CDC, and 50+ national health agencies

No Active Outbreaks Detected

Our AI-powered surveillance hasn't detected significant Arboviral diseases, Powassan virus disease activity in the past 30 days.

Real-time monitoring continues 24/7 across BEACON, ProMED, WHO, CDC, and 50+ global health agencies

What This Means

Currently, Arboviral diseases, Powassan virus disease case counts are within baseline expectations globally. However, diseases can emerge rapidly, which is why continuous monitoring is critical.

Stay Prepared

Download the Virus Watcher app to get instant alerts if Arboviral diseases, Powassan virus disease activity increases in your region or travel destinations.

Prevention Remains Important

Even without active outbreaks, understanding Arboviral diseases, Powassan virus disease prevention helps protect you and your community:

  • Avoid Tick Bites: Use insect repellents containing DEET or picaridin on exposed skin and clothing.
  • Protective Clothing: Wear long-sleeved shirts and long pants when in wooded or grassy areas.
  • Tick Checks: Perform thorough tick checks on yourself, children, and pets after spending time outdoors.
  • Tick Removal: Remove attached ticks promptly and correctly.
  • No Vaccine: Currently, no vaccine is available for humans.
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Expert Resources & References

Trusted information from leading health organizations

CDC

Official guidance from the U.S. Centers for Disease Control and Prevention

View CDC Resources →

WHO

Global disease surveillance and guidelines from the World Health Organization

View WHO Resources →

Research

Latest peer-reviewed research and clinical studies

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Medically Reviewed Content

Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.

Last reviewed: 2026-06-03

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