Rockford, IL – Health officials in northern Illinois are investigating a possible hantavirus case in Winnebago County, with authorities emphasizing that the risk to the public remains very low.
According to the Illinois Department of Public Health (IDPH), the case involves a local resident who may have contracted a North American strain of hantavirus while cleaning a home where rodent droppings were present. Officials said Tuesday the individual is recovering after experiencing mild symptoms and did not require hospitalization.
The case is not connected to the recent hantavirus outbreak linked to passengers aboard the MV Hondius cruise ship, and it does not involve the Andes strain, which is known for rare person-to-person transmission in South America. Health officials confirmed the resident has not traveled internationally and had no contact with anyone tied to that outbreak.
According to IDPH, confirmatory testing is being conducted by the Centers for Disease Control and Prevention (CDC), a process that can take up to 10 days. Initial antibody testing from a commercial lab is not considered definitive.
Public health experts note that North American hantavirus strains are not known to spread between people. Most infections occur through exposure to airborne particles contaminated with rodent urine, feces, or saliva.
State officials are coordinating with the Winnebago County Health Department and the CDC as the investigation continues.
Hantavirus cases remain rare in Illinois. According to IDPH, only seven confirmed cases have been reported in the state since 1993, with the most recent prior case recorded in March 2025. Nationwide, the CDC has documented 890 cases between 1993 and 2023.
Officials are urging residents to rely on verified public health information and remain cautious when cleaning areas with potential rodent activity.
