Utah Confirms First Equine WNV Cases of 2016

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Utah Confirms First Equine WNV Cases of 2016

The Utah State Veterinarian’s Office has received reports of the first and second cases of West Nile virus (WNV) in horses for 2016, the state Department of Agriculture and Food (DAF) reported Aug. 24.

The first case was in an unvaccinated 4-year-old Quarter Horse gelding from Uintah County. The horse was euthanized because of severe clinical signs. The second horse was also unvaccinated and located in Uintah County.

West Nile is transmitted to horses via bites from infected mosquitoes. Clinical signs for WNV include flulike signs, where the horse seems mildly anorexic and depressed; fine and coarse muscle and skin fasciculations (twitching); hyperesthesia (hypersensitivity to touch and sound); changes in mentation (mentality), when horses look like they are daydreaming or "just not with it"; occasional somnolence (drowsiness); propulsive walking (driving or pushing forward, often without control); and "spinal" signs, including asymmetrical weakness. Some horses show asymmetrical or symmetrical ataxia. Equine mortality rate can be as high as 30-40%.

The Utah DAF said data shows that 80% of cases in horses occur during the months of August and September.

“Since West Nile Virus symptoms in horses in surrounding states have been increasing in recent days Utah horse owners are advised to take necessary precautions to protect their animals,” said State Veterinarian Barry Pittman, DVM, MPH, Dipl. ACVPM. “Protective steps would include a good vaccination protocol, mosquito control, and clean-up of areas around barns and stables to minimize mosquito populations,” he added.

Vaccines have proven to be a very effective prevention tool. Horses that have been vaccinated in past years will need an annual booster shot. However, if an owner did not vaccinate their animal in previous years, the horse will need the two-shot vaccination series within a three- to six-week period.

In addition to vaccinations, horse owners also need to reduce the mosquito populations and their possible breeding areas. Recommendations include removing stagnant water sources, keeping animals inside during the bugs’ feeding times, which are typically early in the morning and evening, and using mosquito repellents.

Original article can be seen here.

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