Source:  Various

Alberta

Most recent update was 5/26/11 (Additional information may be found in an interview)

May 26, 2011

Neurotropic Equine Herpesvirus-1 (nEHV-1) Update

Case Summaries:
The status of the three confirmed cases of nEHV-1 has not changed and these horses remain under isolation. One horse displayed neurological symptoms and two horses displayed respiratory symptoms. They are all either recovered or are recovering.

There is a fourth confirmed case in an Alberta horse that had signs of fever and reported a positive test on May 18, 2011. This horse travelled to the show in Ogden and has been in isolation. It was one of the suspect cases previously reported. It is under veterinary care and is recovering.
There is a new suspect case in an Alberta horse that showed neurological signs on May 22, 2011 and was isolated at that time. Laboratory tests are still pending. This horse did not attend the cutting horse show in Ogden, but did attend cutting horse clinics and shows in Alberta. This horse is under veterinary care and is recovering.
A number of horses that were potentially exposed to nEHV-1 in Ogden have been tested for the virus. Our office has been notified of 2 positive tests for nEHV-1 from Alberta horses. These horses have no clinical signs of illness and are not considered to be cases.

Idaho

 

Most recent update was 5/27/11

 

As of 5/27/2011, 1:00pm

• No new cases of suspected or confirmed EHV-1 infection in Idaho horses have been reported to the Idaho State Veterinarian during the past 24 hours.
• To clarify yesterday’s posting…the five horses testing positive are on a premises already observing quarantine because several of the horses there had travelled to Ogden and had fever (1 with neurological symptoms) after their return. Of the five testing positive, two of these horses had attended the NCHA cutting in Ogden, Utah and three were exposed stablemates. The owners are following appropriate biosecurity measures to prevent the spread of the disease outside of the facility. All of these horses are under veterinary care and will remain under quarantine for 28 days from the last test.
• The total of confirmed EHV-1 cases remains at 6 in the state in 2 counties, Canyon and Blaine. Three of the confirmed positive horses have shown symptoms consistent with the neurological form of EHV-1 and the other three have only had fever.
• Unless there are significant changes over the Memorial Day weekend, the next update will be Tuesday, May 31.

Nevada

Most recent update 5/25/11

Sparks, NV - 05/25/2011 - The Nevada Department of Agriculture is reporting the two additional laboratory confirmed case of Equine Herpes Virus 1 (EHV-1) in Nevada resident horses. The two horses are located in Washoe County and were exposed to two horses that attended the 2011 National Cutting Horse Association Western National Championships in Ogden, Utah earlier this month. The event horses did not develop disease. The two cohorts exhibit neurological symptoms.This brings the number of affected horses in NV up to three.

New Mexico

Most recent report was 5/26/11

 

New Cases of Equine Herpes Virus Reported in New Mexico, Including One Death Horse Owners Urged to Limit Travel

The New Mexico Livestock Board says cases of equine herpes virus (EHV) continue to be reported throughout the western United States, including in New Mexico. Dr. Dave Fly, state veterinarian, confirmed the death of a horse in Bernalillo County Thursday, May 26, 2011 from the viral disease and a new case in Torrance County where another horse is showing signs of EHV.
"A total of two horses in central New Mexico have died from the virus. One horse in Lea County has recovered and two in the state are still ill,” said Dr. Fly. “All cases being reported involve horses already placed in one of the three quarantined facilities we have in the state.”

The outbreak is believed to have started with horses that attended the National Cutting Horse Association Championships in Ogden, Utah, earlier this month. A total of 75 confirmed EHV-1 or EHM cases have been reported in nine states including New Mexico. (AZ, CA, CO, ID, NM, NV, OR, UT, WA). Fifteen horses from New Mexico attended the show.

“Although the horses that attended the show have been quarantined for several days, there is still a threat of secondary exposures that may have occurred at other events or by horses that have not yet been identified,” said Dr. Fly. “We believe that an additional seven to ten days is needed before normal equine movement is recommended.”

Horse owners in New Mexico are urged to limit travel to help limit exposure. The New Mexico Livestock Board also recommends that major or large equine events be canceled for the next ten days. Anyone with questions is urged to contact the state veterinarian or visit the provided links.

Oklahoma

Most recent update was 5/26/11

Oklahoma Summary One premise in Oklahoma under quarantine for EHV in Love county. Confirmed as EHV-1 positive This horse attended the Utah cutting horse event, showing mild neurologic signs, and is improving with treatment. The remaining horses on the premise are healthy. No horses from this premise have attended an event in Oklahoma during the past couple weeks and movement will be restricted until the situation is resolved. There are no changes in import regulations and no recommended event cancellations issued by the Oklahoma Department of Agriculture.


Oregon

Most recent update was 5/26/11

As of 12:00 PM on May 26, Oregon has four horses that have tested positive but are not showing clinical signs of the neurological herpes virus (equine herpesvirus myeloencephalopathy) or EHM. A fifth horse developed neurological signs and was euthanized. It tested positive for EHM. All test positive horses are in Clackamas, Deschutes and Umatilla counties. All new cases have occurred in horse facilities that already held test positive horses. All test positive horses are directly linked to the cutting horse event held in Utah from April 30 through May 8, 2011. The 19 Oregon horses that attended the Ogden cutting horse show all remain under quarantine with their stable mates at this time.


Texas

Most recent update was 5/27/11

Equine Herpesvirus-1 (EHV-1) Update May 27, 2011: The Texas Animal Health Commission (TAHC) has one confirmed case of the neurologic form of EHV-1 to report today. Preliminary investigation indicates no connection to the Ogden, Utah NCHA event. A Quarter Horse racehorse stabled in Ector County, TX displayed neurologic symptoms consistent with the disease, and ultimately tested positive for EHV-1. All horses on the premises are under quarantine and will be managed according to USDA recommendations for confirmed cases. Additional information is being gathered to determine if any other horses were exposed.

Regarding the Ogden, UT event, there are currently 12 known horses in Texas that attended the event and 174 cohorts (stablemates) remaining under movement restrictions. There are now a total of 8 premises that have been exposed and those premises are in the following counties: Randall, Parker, Jack, Kerr and Mills counties.

Horse owners should contact event organizers in advance to ensure that scheduled events have not been cancelled. Some other states have established emergency rules for entry as a result of this situation. A list of contact information for all 50 state animal health agencies can be found on the U.S. Animal Association website or on the USDA website.

*Note* To be consistent with reports from the United States Department of Agriculture (USDA) and other states, the TAHC is following USDA guidelines for clinical and suspect cases which have very specific criteria to meet the case definition. Currently “suspect” and “confirmed” cases will be the two types of cases that the TAHC reports. The USDA website outlines the specific definition for what is classified as a “suspect” and/or “confirmed” case.

Utah

Most recent update was 5/28/11

As of Saturday May 28, 2011. There have been no new confirmed cases or suspect cases reported by Utah veterinarians today. All suspect and confirmed cases will continue to be under quarantine for 28 days following the cessation of signs.

There are now six (6) quarantined private locations (Box Elder, Davis, Kane, and Utah (3) counties) with a total of seven (7) confirmed cases and thirteen (13) suspect cases at these locations. To date, two of the Utah cases were humanely euthanized after going down and being unable to return to their feet.

 

Washington

Most recent update was 5/27/11

Update 5/27/2011:
Positive Cases in Washington State = 7
Counties with confirmed EHV-1 cases: Thurston, Spokane, Chelan, Asotin, Whitman (3)
Confirmed deaths to date = 0