Chicago Reports First West Nile Death of 2026 Amid Wet Summer

By Mintesinot Nigussie  |  September 2, 2026

Chicago has reported its first death from West Nile virus in 2026, along with two human cases, as unusually heavy summer rainfall creates favourable conditions for mosquito breeding across the city.

The Chicago Department of Public Health said the city has recorded two confirmed human cases of West Nile virus this year, including one fatal case. The Illinois Department of Public Health has separately confirmed several additional cases elsewhere in the state.

“2026 has seen the rainiest summer in Chicago in years, giving mosquitoes ample opportunities to breed,” said Garth Walker, commissioner of the Chicago Department of Public Health. He urged residents to take measures to prevent mosquito bites and eliminate standing water around their homes.

The first death in Illinois linked to West Nile virus this year has prompted renewed warnings from state health officials, particularly for people at higher risk of severe illness.

West Nile virus is the most common mosquito-borne disease in Chicago and the United States. Most people infected with the virus do not develop symptoms, while about one in five develop fever and flu-like illness. Severe disease occurs in about one in 150 infections and is more likely among people aged over 60 and those with certain chronic conditions or weakened immune systems.

There is no specific treatment for West Nile virus, making prevention of mosquito bites the main way to reduce the risk of infection.

Chicago has expanded mosquito-control measures in response to the risk. The city said its programme includes treating more than 80,000 catch basins with larvicide, collecting and testing mosquitoes for West Nile virus and spraying insecticide in areas where adult mosquito activity warrants intervention.

The city has sprayed in 15 community areas in recent weeks, including Beverly, Chatham, O'Hare, Roseland, South Deering, Washington Heights and West Pullman. Chicago currently rates the West Nile virus risk as moderate.

Health officials are advising residents to use EPA-registered insect repellents, remove standing water from containers and other outdoor areas at least weekly, keep grass and weeds short and wear long sleeves, trousers and other protective clothing when outdoors between dusk and dawn.

Residents are also advised to ensure windows and doors are properly screened and to report areas of stagnant water where mosquitoes could breed.

People with weakened immune systems are being urged to consider avoiding outdoor activity during peak mosquito hours, from dusk to dawn.

West Nile virus is generally transmitted to people through the bite of an infected mosquito and is not normally spread from person to person.

Source: FSX Business News