West Nile Virus Confirmed in 27 Indiana Counties in 2025

The Indiana Department of Health has confirmed that mosquitoes in 27 Hoosier counties have tested positive for West Nile virus. The health organization has also reported that one Indiana resident has tested positive, marking the first human case of the virus in 2025.

So far in 2025, the Indiana Department of Health has tested 955 mosquito pools across the state. Of those, mosquitoes from 128 pools have tested positive for West Nile.

Mosquitoes Test Positive Across 27 Indiana Counties

Mosquito pools found in 27 Indiana counties have tested positive for West Nile so far in 2025:

Allen
Boone
Clark
Clay
Clinton
Delaware
Fountain
Gibson
Grant
Greene
Hamilton
Henry
Howard
Madison
Marion
Montgomery
Posey
Putnam
Randolph
Rush
St. Joseph
Shelby
Spencer
Tipton
Vigo
Warren
Wayne

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First Human Case Confirmed in Southern Indiana

While many of the positive pools have been found in Central Indiana, one human case of West Nile has been confirmed in Southern Indiana in Vanderburgh County. At this time, there is no additional information regarding the human case of West Nile virus.

Ildar Abulkhanov

West Nile Virus Symptoms and Risks

Most commonly, West Nile virus is spread through the bite of an infected mosquito. According to the Centers for Disease Control and Prevention, symptoms of the virus in humans can include headache, body aches, and fever, as well as nausea, vomiting, and diarrhea. At this time, there are no known medicines to treat West Nile.

...most people infected with West Nile virus do not feel sick. About 1 in 5 people who are infected develop a fever and other symptoms. About 1 out of 150 infected people develop a serious, sometimes fatal, illness. - CDC

How to Protect Yourself From Mosquito-Borne Illness

Taking steps to avoid mosquito bites is the best course of action to prevent a West Nile virus infection. This includes wearing long sleeves and pants while outdoors, using insect repellent, and controlling the mosquito population around your home by eliminating all standing water.

West Nile isn't the only disease carried by mosquitoes. Keep reading to learn about ten more diseases transmitted by these tiny flying pests, and five plants that can help repel pests from your yard.

11 Mosquito-Borne Illnesses in the U.S.

The mosquito is the most deadly creature in the world, not because of its great size but because of its ability to transmit illnesses through its bite. Below are 11 illnesses carried by mosquitoes.

Gallery Credit: Kat Mykals

These 5 Plants Can Help Repel Pest From Your Lawn and Garden

If you have 99 problems and skunks, gophers, rodents, ants, or mosquitoes in your yard are one of those problems, keep reading. We've got the scoop on five plants you can use to rid you of your unwanted visitors.

Gallery Credit: Kat Mykals

Source: West Nile Virus Confirmed in 27 Indiana Counties in 2025