The Mosquito and West Nile Virus
Although mosquito-borne disease is rare in Illinois, mosquitoes can carry at least three encephalitis viruses that can cause human disease. In 2001, West Nile virus (WNV) was detected for the first time in Illinois in birds, horses, and mosquitoes. West Nile virus causes encephalitis primarily in older adults.
For more information regarding Vector Control and Surveillance in Illinois, follow please visit https://dph.illinois.gov/topics-services/environmental-health-protection/vector-control-surveillance.html