Indiana West Nile Virus 2025 Update

The Indiana Department of Health has a new Mosquito-Borne Illness Dashboard (↗) featuring two statewide maps. These maps show counties with mosquitoes and people infected by the West Nile Virus. The right-side map shows human infections. So far in 2025 as of September 5th, there were 10 people infected in the counties of Bartholomew (1), Hamilton (1), Madison (1), Marion (4), Vanderburgh (6), and Wells (1).

Almost all counties have at least one infected mosquito (based on test results) except the following ones mostly in Southern Indiana: Crawford, Dubois, Jefferson, Lawrence, Martin, Orange, Owen, Perry, Pike, Vermillion, and Washington. Union County has not tested for mosquitoes so far this year, or the test results have not been updated on the map. At first, the left map shows Hamilton County (Carmel, Fishers, Noblesville, Westfield, etc.) with the most mosquito infections at 128. However, the Collection tab and corresponding mosquito collection map shows this county tested a tremendous amount of mosquitoes (28,112) for the virus resulting in the inflated infection number. By comparison, Marion County (Indianapolis area) has 48 mosquito infections based on 9,847 tests.