The Kane County Health Department (KCHD) is reporting the first two human cases of West Nile virus in Kane County for the 2026 mosquito season. Both individuals are Aurora residents and developed the more serious, neuroinvasive form of West Nile virus requiring hospitalization.
“These cases are a reminder that West Nile virus is present in our community and that mosquito bite prevention remains important throughout the remainder of the mosquito season,” said Michael Isaacson, KCHD executive director.
West Nile virus is most commonly spread to people through the bite of an infected Culex mosquito, commonly known as a house mosquito. Mosquitoes become infected when they feed on birds carrying the virus and can then transmit the virus to people and other animals.
Most people infected with West Nile virus do not develop symptoms. Approximately one in five people develop a fever and other symptoms such as headache, body aches, joint pain, vomiting, diarrhea or rash. A small number of people develop severe illness that can affect the brain and nervous system, including encephalitis or meningitis. Individuals age 60 and older and people with weakened immune systems are at greatest risk for severe disease.
The best way to prevent West Nile virus is to avoid mosquito bites:
•Use insect repellent. Apply an EPA-registered insect repellent containing DEET, picaridin, IR3535, oil of lemon eucalyptus or para-menthane-diol according to label directions.
•Wear protective clothing.
•Eliminate standing water.
•Maintain screens.
•Keep grass and weeds trimmed.
—Kane County government