West Nile Virus

What is West Nile Virus?


West Nile Virus (WNV) is an infection caused by a virus transmitted by mosquitoes. Most individuals infected with WNV do not experience any signs or symptoms, or may experience only minor ones, such as fever and mild headache.

Anyone can become infected with WNV so it is important to protect yourself from mosquito bites. Individuals over the age of 50 and those with chronic diseases such as heart disease or cancer may be more at-risk for serious illness. Most human cases occur in the late summer and early fall. Please select from the following options, or contact the Environmental Health Division at 847-664-4059 for more information.