The Illinois Department of Public Health (IDPH) is warning Illinois residents about the first confirmed case of a rare virus in the state. Resident Hospitalized with Rare VirusAccording to an IDPH press release, the first serious case of Powassan virus has been confirmed in the state. It’s important for everyone to guard against tick bites and the serious illnesses they can cause. Understanding the Powassan VirusBlacklegged ticks are the primary source for the spread of the Powassan virus. State Conducting Tick SurveillanceIn response to the first active case of the Powassan virus, IDPH will begin conducting tick surveillance in areas where the resident spent time before illness.