Two More Horses Test Positive for EEE in Indiana

The horses resided in LaGrange and Kosciusko counties and are both deceased.

Map of LaGrange and Kosciusko counties
Two horses in LaGrange and Kosciusko counties, Indiana, were confirmed positive for EEE and are both deceased. Wikimedia Commons

On Sept. 30, The Indiana State Board of Animal Health confirmed the second and third Eastern equine encephalitis (EEE)-positive horses in Northeast Indiana in 2022.  

An unvaccinated 15-year-old mare in LaGrange County tested positive for EEE. She began showing signs on Sept. 23 and presented initially with a 104-degree fever but responded to treatment. Within 24 hours, however, she was down and did not have normal reflexes and was subsequently euthanized.  

An unvaccinated 14-year-old mare in Kosciusko County tested positive for EEE, as well. She became ataxic (incoordinated) on Sept. 22 and progressed to recumbency (down and unable to rise). She is since deceased.  

EDCC Health Watch is an Equine Network marketing program that utilizes information from the Equine Disease Communication Center (EDCC) to create and disseminate verified equine disease reports. The EDCC is an independent nonprofit organization that is supported by industry donations in order to provide open access to infectious disease information.

EEE 101

Eastern equine encephalomyelitis is caused by the Eastern equine encephalitis virus, for which wild birds are a natural reservoir. Mosquitoes that feed on EEE-infected birds can transmit the virus to humans, horses, and other birds. Horses do not develop high enough levels of these viruses in their blood to be contagious to other animals or humans. Because of the high mortality rate in horses and humans, EEE is regarded as one of the most serious mosquito-borne diseases in the United States.

Tips for preventing mosquito-borne diseases include:

  • Avoid mosquito bites: Use insect repellent when outdoors, especially from dusk to dawn.
  • Look for EPA-labeled products containing active ingredients such as DEET, picaridin (KBR3023), or oil of lemon eucalyptus (p-menthane 3,8-diol).
  • Apply more repellent, according to label instructions, if mosquitoes start to bite.
  • Mosquito-proof homes: Fix or install window and door screens, and cover or eliminate empty containers with standing water where mosquitoes can lay eggs.
  • Protect your horses: Veterinarians recommend commercially available licensed vaccines against EEE for all horses in the U.S. Horses should be vaccinated at least annually (recommendations vary in high-risk areas). It’s not too late this year to vaccinate your horses.
  • Use approved insect repellents to protect horses.
  • If possible, put horses in stables, stalls, or barns during the prime mosquito exposure hours of dusk and dawn.
  • Eliminate standing water, drain water troughs, and empty buckets at least weekly.
  • Stock water tanks with fish that consume mosquito larvae (contact your local mosquito control for assistance), or use mosquito “dunks” (solid “donuts” of Bacillus thuringiensis israelensis[BTi], which are nontoxic to horses) available at hardware stores.
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