Ticks in Winnebago County Test Positive for Rare Powassan Virus

Health officials urge residents to take precautions against tick bites

Mar. 27, 2026 at 8:50am

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Health officials in Winnebago County, Illinois have announced that ticks in the area have tested positive for the rare and potentially serious Powassan virus. The virus can lead to complications affecting the heart, skeletal, and nervous systems, and there is no vaccine available. Residents are advised to watch for symptoms like fever, headache, vomiting, and confusion, and to take steps to prevent tick bites.

Why it matters

The discovery of Powassan virus-positive ticks in Winnebago County is concerning, as the virus can cause severe neurological issues and there is no treatment or vaccine available. This finding highlights the importance of tick prevention measures for residents in the area, especially during tick season.

The details

According to a community announcement, ticks in Winnebago County have tested positive for the Powassan virus for the first time. Powassan virus can lead to serious health complications affecting the heart, skeletal, and nervous systems. Symptoms can include fever, headache, vomiting, weakness, confusion, difficulty speaking, seizures, and paralysis. While initial symptoms like fever and headache may come first, more severe symptoms like seizures and confusion can follow.

  • The announcement of Powassan virus-positive ticks in Winnebago County was made on March 27, 2026.

The players

Illinois Department of Public Health

The state health department that maintains the Illinois Tickborne Disease Dashboard with information on preventing and treating tick-borne illnesses.

Winnebago County Health Department

The local health department that is advising residents on the Powassan virus discovery and providing guidance on tick bite prevention.

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What’s next

Residents are advised to contact their healthcare provider if they experience any symptoms of Powassan virus after a tick bite or exposure. The Illinois Department of Public Health and Winnebago County Health Department are continuing to monitor the situation and provide updates to the community.

The takeaway

The discovery of Powassan virus-positive ticks in Winnebago County underscores the importance of taking preventive measures against tick bites, such as using insect repellent, checking for ticks after being outdoors, and promptly removing any attached ticks. Residents should remain vigilant and seek medical attention if they develop concerning symptoms.