As West Nile virus (WNV) continues to appear across the United States this mosquito season, Idaho horses are being hit hard. More than 300 horses have been diagnosed with the illness in 2006.


Marilyn Simunich, DVM, of the Idaho Animal Health Laboratory, has been gathering histories on the infected horses.


“We call the vet offices and ask if the horse was vaccinated, and over 86% (of the infected horses) never had any vaccinations, 15% had maybe one, or were just vaccinated for the first time,” Simunich said.


About one-third of the infected horses have died or have been euthanatized

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