EHV-1 Outbreak

Another horse in Montana is diagnosed with the neurological form of equine herpesvirus type-1.

The American Quarter Horse Journal
March 25, 2013

AQHA Ranching photo

To learn more about EHV-1 and EHM, visit the AQHA EHV-1 Information page. (Journal photo)


From the Montana Department of Livestock (March 25, 2013)

A 6-year-old mare in Gallatin County, Montana, has tested positive for equine herpesvirus type-1, but is not related to a case in Flathead County reported late last week.

“We have another case of EHV-1, but let me stress that there is no connection to the earlier case,” said assistant state veterinarian Dr. Tahnee Szymanski. “Fortunately, the Gallatin County case, like the Flathead case, appears to be an isolated event.”

The Gallatin County infected horse arrived in Montana three weeks ago from southern California. The horse began showing clinical signs of the virus last week; test results received Saturday morning confirmed presence of the virus.

The horse is housed at a boarding and training facility, which is currently under quarantine, in Gallatin County. An encouraging sign, Syzmanski said, is that none of the other horses at the facility have shown any clinical signs of contracting the virus.

“The manager and trainers at the facility has been great to work with, and are letting all of their clients know about the incident,” Szymanski said.

Visit www.liv.mt.gov to read more about the EHV-1 cases in Gallatin and Flathead counties.


From the Illinois Bureau of Animal Health and Welfare (March 20, 2013)

The most recent clinical case of EHV-1 infection at the quarantined stable in Lake County, Illinois, occurred on March 15. Since that time, no other cases of fever or clinical signs have been reported. Horses that were affected with clinical signs during this event are responding favorably to treatment and physical therapy and continue to recover. Increased biosecurity measures continue to be practiced at the stable.

This is the only premises under quarantine at this time. The Illinois Department of Animal Health and Welfare has received no additional confirmed reports of cases outside of the quarantined facility.

Visit www.agr.state.il.us to read the rest of this news release.


From the Florida Department of Agriculture and Consumer Services (March 13, 2013)

The Florida Department of Agriculture and Consumer Servicesquarantine affecting more than 1,000 horses that had been exposed to EHV-1 at the Horse Shows in the Sun show grounds in Ocala.

“We appreciate the cooperation of those who were affected by the quarantine,” said Commissioner of Agriculture Adam H. Putnam. “Together, we were able to treat the horses affected and prevent this potentially fatal disease from infecting other horses in Florida or around the country.”

The department confirmed the first positive case of EHV-1 on February 20 involving a horse that had been at the HITS show grounds. The case was referred to the University of Florida College of Veterinary Medicine after showing clinical neurological signs. A second horse exposed on the HITS show grounds also developed neurological signs and was referred to the College and isolated for treatment. Both horses have recovered and tested negative to three consecutive tests and are being moved out of isolation.

Eight more cases of EHV-1 that were linked to the horse show were confirmed in Florida. The department issued a quarantine order to the entire venue hosting the event and other areas where exposed horses had traveled. In all, horses on 15 sites, including the show grounds, were placed under quarantine as a result of exposure to positive cases. Other horses are being released as they meet quarantine release requirements.

Horses under quarantine were monitored for signs of the virus infection, including fever and nasal discharge. The department worked with management, trainers and veterinarians on the site to help prevent the further spread of disease.

Continue reading the news release at www.freshfromflorida.com.

EHV-1 Preparedness

Please use these resources regarding EHV-1, EHM and biosecurity, brought to you by The American Quarter Horse Journal:

  • Travel Safely: Good biosecurity both at home and on the road will help keep your horses healthy.
  • The Facts on EHV-1: Recognize the signs of equine herpesvirus-1 and learn how to protect your horse from the risks of the virus.
  • Strike a Balance With EHV-1: Learn how to strike a balance between showing and protecting your herd against equine herpesvirus-1 myeloencephalopathy with tips from Dr. Tom Lenz.
  • EHV-1 Testing: AQHA Professional Horseman Al Dunning weighs in on his experience with EHV-1 testing, and Dr. Tom Lenz suggests alternatives to testing.

To learn more about EHV-1 and EHM, visit the AQHA EHV-1 Information page.