There have been no additional cases of horses infected with equine herpesvirus-1 (EHV-1) in Oregon this week, State Veterinarian Brad LeaMaster, DVM, PhD, said.

Over the previous two weeks, nine horses either developed neurologic signs of infection or developed fevers with no neurologic signs after being exposed to EHV-1. All horses involved remain under active observation by owners and their veterinarians. Eight farms remain under quarantine: six in Marion County and two in Polk County.

There have been no deaths associated with the EHV-1 outbreak so far. Two horses that were hospitalized at Oregon State University College of Veterinary Medicine’s Large Animal Hospital have responded to treatment and have been sent home.

“The fact that there have been no new reports of the virus in Oregon is encouraging news and may indicate that the outbreak situation has stabilized,” says LeaMaster.

All affected horses have been linked to an Oregon High School Equestrian Team (OHSET) meet at the Linn County Fairgrounds on April 16-19.

“I am aware that many equine shows and other events have been cancelled or postponed this past week,” said LeaMaster. “It is a very tough decision to make, however, I commend those event organizers who made that call as well as the many horse owners who decided to just stay home. That was a responsible thing to do and I feel that those actions have been the key reason for no new infections being reported this past week.”

The Oregon Department of Agriculture has received many inquiries from concerned horse owners on what to do if they have a potentially exposed horse