AHC, AAEP Work With USDA to Coordinate EHV-1 Case Reporting

Horses exposed to the equine herpesvirus (EHV-1) based on attending an event held in Utah will now be monitored through a national case reporting system. In addition, a guidance document was sent to state animal health officials and Area Veterinarians in Charge (AVIC) in each state on May 17, courtesy of the USDA's Animal and Plant Health Inspection Service (APHIS), Veterinary Service (VS).

In response to confirmed cases of EHV-1 and equine herpesvirus myeloencephalopathy (EHM, the neurologic form of EHV-1) in horses that attended a cutting horse event in Ogden, Utah held from April 29 to May 8, 2011, the American Horse Council (AHC) and the American Association of Equine Practitioners (AAEP) contacted the USDA:APHIS:VS and requested federal coordination for data collection, dissemination, and communication efforts among state and federal veterinarians. The purpose of collecting this data is to protect the health of horses and mitigate the economic implications of further EHV-1 transmission to unaffected horses.

In response, USDA:APHIS:VS has reached out to state animal health officials, federal AVICs, and private practitioners to collect current information on the EHV-1 disease incident and develop a coordinated response among state, federal, and industry partners. The full scope of the current EHV-1 situation and a complete accounting for the number of horses affected and/or exposed is under way.

"We want to applaud the quick response and efforts of the USDA:APHIS:VS," said William A. Moyer, DVM, 2011 AAEP president. "Having the support and coordination of this effort by the USDA:APHIS:VS working in collaboration with state animal health officials, will be key in providing accurate and timely information to the equine and veterinary communities during this outbreak."

"USDA can play a critical and timely role in collecting, verifying, and disseminating accurate information to state animal health officials and industry partners," said Jay Hickey, president of the AHC. "These efforts are essential to mitigating the health and economic implications of this current EHV-1 situation. Misinformation can often be an epidemic in and of itself. This latest disease incident only underscores the importance of implementing a proactive national equine health program."

The USDA and state animal health officials have initiated an investigation and incident response effort. The USDA plans to release the initial report through summarization of information provided by the state animal health officials and AVICs including the number of horses suspected and confirmed as EHV-1 cases and EHM cases along with fatalities in the coming days. The USDA will update and release future reports on the current EHV-1 outbreak on a weekly basis. If the current incident results in widespread exposure or a large influx of infected horses, the USDA will provide that information as it becomes available.

Practitioners are encouraged to notify their state animal health officials of suspect or confirmed cases of EHV-1 and EHM. The state animal health officials can assist with guidelines on diagnostic testing and management to reduce risk of spreading EHV-1.

There have been numerous scientific articles citing a wide variation in the number of suspect and confirmed cases of the EHV-1 and the neurologic form of the disease (EHM) in horses. This large disparity in reported information underscores the importance of allowing USDA and state animal health officials to collect data, based on the use of consistent case definitions, to then verify information gathered and disseminate factual summary information.

Until state and federal animal health officials are able to gather, verify, and disseminate accurate information on the scope of the current incident, it is critical for individual horse owners and organizations to undertake appropriate and responsible actions to mitigate the welfare and economic implications of potential future transmissions.

At the time this release was issued, only Colorado and Wyoming had implemented enhanced state entry requirements in response to the ongoing EHV-1 disease situation.

Additionally, if you anticipate transporting your horse across state lines it is recommended you contact each respective state/provincial veterinarian's office prior to departure to determine if any restrictions or enhanced entry requirements exist due to the current EHV-1 incident. To find your state or provincial animal health office, visit aaep.org.

About the Author

American Association of Equine Practitioners

AAEP Mission: To improve the health and welfare of the horse, to further the professional development of its members, and to provide resources and leadership for the benefit of the equine industry. More information: www.aaep.org.

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