Wyoming official confirms West Nile virus in Fremont County horse

The State Animal Health Official has confirmed a case of West Nile virus (WNV) in a horse located in Fremont County, Wyoming.

West Nile virus is transmitted to horses through the bites of infected mosquitoes. While not all infected horses display clinical symptoms, those that do may experience flu-like signs, muscle twitching, hypersensitivity to touch or sound, changes in mental activity, drowsiness, or spinal issues such as asymmetrical weakness and ataxia.

There is currently no cure for the virus, though some horses may recover with supportive care. Equine mortality rates for the disease can reach between 30% and 40%. Experts recommend vaccination as an effective prevention tool, noting that previously unvaccinated horses require a two-shot series, while vaccinated horses may need annual or bi-annual boosters depending on the mosquito season.