Topics

Breeding and Reproduction

Horse breeding from planning through foal care

Hoof Care

Prevention and treatment for problems of the equine foot

Nutrition

Proper feeding practices for foals, adult horses, and older horses

Welfare and Industry

Discussions about the welfare of our equine friends

Diseases and Conditions

Horse-heath-problem risk factors, prevention, diagnosis, and treatment

Horse Care

How to care for the basic health needs of horses

Sports Medicine

All aspects of caring for performance horses

All Topics

Farm and Barn

Design and maintain a healthy horse operation

Lameness

Prevention, diagnosis, and treatment of leg lameness

Vet and Professional

News and issues for equine health professionals
Magazine
Cover Story

Supporting Your Horse's Immune System

What does it take to optimize the equine immune response and fight off disease?

Also in this Issue

Rhodococcus equi Pneumonia: Rethinking Treatment to Fight Resistance
Skill, Science, and Sensitivity: Unpacking Horse Training Misconceptions
Rehabilitating the Neurologic EPM Horse
Building a Balanced Diet for Your Mare and Foal
Joint Health Matters: Top Therapies for a Successful Season
The Abscess Ruptured, But My Horse is Still Lame. Now What?
Understanding Horse Aggression
Digital Edition

Give a Gift

Subscribe

Manage My Subscription
News

Latest News

Feeding Programs for Orphan Foals

Respiratory Viruses and Performance Horse Health

Florida Quarter Horse Positive for Strangles

Ontario Appaloosa Positive for Equine Influenza

Ontario Yearling Tests Positive for Strangles

Oklahoma Filly Tests Positive for EIA

More News

Disease Alerts

EDCC Health Watch

Event Coverage

2024 AAEP Convention
2024 EquiSUMMIT
2024 Olympics
Features

Latest Features

Managing Your Performance Horse’s Joints

April 9, 2025

Understanding, Recognizing, and Managing Pain in Horses

March 20, 2025

Additional Features

Protected: Equine Metabolic Syndrome

How Much Does It Cost to Own a Horse?

Dealing With Equine Colic: Here are 33 Do’s and Don’ts

Promoting Longevity in Performance Horses

Everything You Need to Know About Laminitis in Horses

All Features
Q&As

Latest Q&A

Nutritional Support for Horses With Cellulitis

April 24, 2025

Equine Nutrition FAQ Series

Sponsored by Purina Animal Nutrition

Learn More

Q&As

Equine Behavior

Our animal behavior experts field your questions about why your horse does XYZ.

Horse Nutrition

Equine nutritionists respond to queries about forage, grain, supplements, and other related topics.

Performance Horse Health

Veterinarians and researchers tackle questions about equine athletes.
Visuals

Featured Media:

Wound Care Strategies for Healing Wounds in Horses

Tips for Feeding Senior Horses

Quick Links

Webcasts

Infographics

Slideshows
Podcasts

Featured Podcasts

Caring for Young Horse Joints

Equine Innovators: Improving Joint Health in Horses With Orthobiologics

Podcasts

Ask 'TheHorse' Live

The Horse’s experts answer your questions during a monthly live audio event.

Equine Innovators

Join us as we interview leading equine researchers from the University of Kentucky.

All Podcasts
Free Reports

Fact Sheet: Pituitary Pars Intermedia Dysfunction (PPID)

Fact Sheet: Equine Protozoal Myeloencephalitis (EPM) in Horses

Free Reports:

View All Free Reports

Quick referenced of horse conditions, diseases and health topics

Forms

Checklists and identification forms for horse owners
Tools

Normal Horse Vital Signs and Health Indicators

Mare Gestation Calculator

Adult Horse Weight Calculator

Additional Resources

Event Calendar
Horse Health Glossary
Get-A-DVM
New Products
Polls
TheHorse.com en Español
StableManagement.com

WNV in California Horses: Case Confirmed in Sacramento County

November 9, 2018
Posted by Erica Larson

A yearling Grade filly with unknown vaccination history began displaying neurologic signs. She tested positive for WNV and was euthanized.

Topics: Diseases and Conditions, Neurologic Disease, West Nile Virus (WNV)

Favorite

Please login to bookmark

Please login to access.

West Nile virus is transmitted to horses via bites from infected mosquitoes. | Photo: iStock

California animal health officials have confirmed another equine case of West Nile virus (WNV). So far this year, there have been 11 confirmed cases of WNV in California horses.

“On Nov. 2, 2018, a 1-year-old Grade mare in Sacramento County with unknown vaccination history, displaying neurologic signs was confirmed positive for West Nile virus,” the California Department of Food and Agriculture (CDFA) said in a statement on its website. “The mare was euthanized due to severity of clinical signs

Create a free account with TheHorse.com to view this content.

TheHorse.com is home to thousands of free articles about horse health care. In order to access some of our exclusive free content, you must be signed into TheHorse.com.

Start your free account today!

Already have an account?
and continue reading.

Erica Larson

Erica Larson, former news editor for The Horse, holds a degree in journalism with an external specialty in equine science from Michigan State University in East Lansing. A Massachusetts native, she grew up in the saddle and has dabbled in a variety of disciplines including foxhunting, saddle seat, and mounted games. Currently, Erica competes in eventing with her OTTB, Dorado.