VSV California Cases

We have received information from our local veterinarians that Vesicular Stomatitis (VS) has been confirmed in San Diego and Riverside Counties

VS is a viral disease that can affect horses, donkeys, mules, cattle, swines, and camelids. Rarely, it can also affect humans.

What to look for with your horse:

  • Ulcerations of the lips, muzzle, nostrils, and tongue
  • Difficulty eating and excessive drooling due to ulcerations on tongue
  • Ucerations and erosions at coronary band that cause lameness

It is spread via black flies, sand flies and biting midges. Additionally, it can be transmitted by touching affected lesions, through shared water or feed sources.


  • Isolate affected animals and do not move them on or off property
  • Do not travel to areas where there is currently an outbreak (San Diego County and Riverside County)
    1. Promote air circulation with fans and open breezeways/doors
    2. Clean up manure and urine more frequently
    3. Keep waste as far away as possible from where horses are stabled
    4. Apply insect repellent to horses, including wiping it on the inside of their ears where black flies like to feed!
  • Wear gloves when working with affected horses
  • Practice good biosecurity (do not share tack, equipment, waters, do not let unfamiliar horses touch nose to nose)

The best advice is to keep your horses at home. San Diego County and Riverside County are getting close to home. If you attend a show, roping, or any other competitions where the horses are coming from all over, you never know if they have come in contact with a horse that has been exposed to VS. While it is not life threatening, we urge you to read up on it as it sounds miserable for our poor equine friends. Again, the advice we were given is to keep your horses home until this passes.


DeeDee Friedrich, YLCR President
Dee Dee Friedrich, YLCR President

Join us for our Quarterly Meetings

Yorba Linda Community Center • Casa Loma & Imperial Hwy
EVERYONE is welcome! Horse ownership is not a requirement.

  • February 1, 2023 @ 7:00 pm
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Yorba Linda Country Riders

    • We are neighbors and family and friends.
    • We share a common interest with all city residents in our desire to see an active, prosperous community.
    • We strive to promote the development of parks, multi-purpose trails, and recreation areas.
    • We encourage family participation . . . time spent in rewarding and enjoyable activities.
    • We feel that our goals can be met by participating in the city’s only equestrian club.
    • We share a common interest in maintaining and assuring the horse and rider’s part in our community.
    • We strive to promote cooperation between equestrians and non-horse owners … a relationship providing long range benefits for everyone.
    • We encourage safety and good horsemanship.
    • WE INVITE YOU TO PARTICIPATE … Help us to provide education for the protection, promotion, and preservation of all aspects of the equine heritage that defines our community.
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The primary mission of the Yorba Linda Country Riders, as set forth herein, is the dedication to the aesthetics of a semi-rural atmosphere that represents the historical heritage of Yorba Linda. Through the avenue of educational enterprise, the objective of the Yorba Linda Country Riders endeavors to promote, preserve, and protect all aspects of the equestrian element of Yorba Linda and surrounding areas by also supporting the efforts of like-minded organizations where appropriate.

Furthermore, the Yorba Linda Country Riders supports the concept of humane and ethical treatment of all animals and believes that humans have an inseparable relationship with the natural world. Unnecessary hardship imposed upon animals as a result of a relationship with humans will not be tolerated, and membership in the Yorba Linda Country Riders will be terminated where willful abuse of equines and other animals is determined to occur.