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COVID-19 Advisory: WSU Extension is working to keep our communities safe. All Extension programming is being provided virtually, postponed, or canceled. Effective March 16, 2020, WSU Extension county offices and WSU Research & Extension Centers will be closed to the public. We are available via email, phone, and webconference.

Horse Health Notes

Program Contact: Bridget Rohner, WSU Extension Youth Family & Community Education, Lincoln-Adams
(509) 725-4171 •

Lincoln-Adams 4-H Program Coordinator: Randy Williams
(509) 725-4171 •

Lincoln-Adams WSU Extension Program Assistant: Karen Robertson
(509) 659-3209  •

Important information for horse owners

Equine Health Resources       Return to 4-H Horse Announcements

Cover of Publication: West Nile Virus - Protect Your Horse from West Nile Virus - WSU Fact Sheet6/8/2017 – West Nile Virus in Horses


Hi all – please encourage 4-H horse project youth, leaders, and parents to vaccinate 4-H project horses (ALL horses, actually) for West Nile Virus. Previously vaccinated horses need an annual booster in early spring to optimize protection for the coming mosquito season. Naïve horses need a series of two vaccines and will not achieve adequate protection until a week after the second injection, so time is of the essence.

WNV would be a great topic for educational posters! Comparing WA and US stats is enlightening—we often lead the country in the number of equine casesL. Here is where 2017 updates will be located:

A WSU pub on WNV is at

Susan Kerr, DVM, PhD, PAS
Washington State University
Northwest Regional Livestock and Dairy Extension Specialist
Northwestern Research and Extension Center
16650 St. Rt. 536, Mount Vernon, WA 98273

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It’s that time of year – when mosquitoes are out and the potential for West Nile Virus infections are here. Because Washington state lost a number of horses to this disease last year and it is preventable, we need to get the word out.

The Continuing Veterinary Medical Education Program and the Department of Veterinary Clinical Sciences is providing a FREE program to the public about West Nile Virus in Horses.

Dr. Jenifer Gold, faculty member in CVM, recorded ”West Nile Virus – It Hasn’t Gone Away!

Course Description
This presentation is for owners  and veterinarians to understand what West Nile Virus is, the history of the disease and its spread across the United States. Discussion of the clinical signs includes videos. Treatment protocols will be reviewed and the importance of prevention are discussed.

Free public presentation can be viewed at (public link – no login required):

Veterinarians interested in receiving 1 CE credit, can register and pay a $50 course fee.   To view the On-Demand Program on Equine West Nile Virus visit:

Thank you for getting the word out to your horse owners and veterinarians!


Dale A. Moore, DVM, MPVM, PhD, Dipl. ACVPM
Professor and Director, Veterinary Medicine Extension and FDIU
Director, Continuing Veterinary Medical Education
Dept. Veterinary Clinical Sciences, College of Veterinary Medicine
Washington State University, PO Box 646610, Pullman, WA 99164-6610
(509) 335-7494

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Visit with YOUR Veterinarian and discuss the best protocols for YOUR equines!

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July 26, 2016 (LAST YEAR)

The Washington State Department of Agriculture (WSDA) is reporting that a two-year-old Andalusian mixed breed mare in Grandview is the first horse in Washington to contract West Nile virus this year. The horse was not vaccinated for the disease and is showing neurologic signs of the illness including stumbling and difficulties eating.

Washington had 36 confirmed cases of horses with West Nile virus last year, leading the nation with nearly 17% of confirmed equine cases. And this year, mosquitoes testing positive for West Nile virus have been trapped in Adams, Benton, Grant, Franklin and Yakima counties.

“It’s never too late to vaccinate your horse for West Nile virus,” said WSDA field veterinarian Dr. Thomas Gilliom. “We’ve had cooler days but when hot summer days return the risks of mosquito bites will increase.”

Spring is the best time to vaccinate horses against West Nile virus or obtain an annual booster shot. However, horses may still benefit from first-time vaccinations or an annual booster shot.

Besides vaccination, horse owners can take action to limit horse exposure to mosquitoes. For example, reduce or eliminate sources of stagnant or standing water, stable horses during peak mosquito periods (at dawn and dusk), use equine-approved mosquito repellants, place fans inside barns or stalls to maintain air movement, and avoid using incandescent bulbs inside stables at night.

Veterinarians who learn of potential West Nile virus cases in horses or other animals should contact the State Veterinarian’s Office at (360) 902-1878.

Visit the websites of the state Department of AgricultureDepartment of Health, or the U.S. Department of Agriculture for more information.

More Equine Disease Resources:

FAQ: Regarding Equine Herpesvirus (EHV) (From 2016)

West Nile Virus – Protect Your Horses from West Nile Virus – WSU Fact Sheet

West Nile Encephalitis in Horses – Courtesy of PennState

WSU News Release Concerning 2016 EVH1 Case

Horse Health – Courtesy of American Association of Equine Practitioners