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Outbreak of Equine Herpes Myeloencephalopathy (EHM) Bulletin

May 18, 2011

Currently, there are numerous reports of equine herpesvirus myeloencephalopathy (EHM) affecting horses and farms across the U.S. and Canada. This outbreak appears related to initial cases at a cutting horse show in Ogden Utah, which was held from April 29 - May 8. Horses at that event may have been exposed to this virus and subsequently spread the infection to other horses. While the true extent of this disease outbreak is uncertain, there is clearly a very significant elevated risk of EHM cases at this time.

At this point there are no reports of any clinical cases in the Greater Toronto Area, however we are on high alert and will keep you appraised of any local developments. Please click on the following link for the official AAEP information brochure for more information. It is important to note that there are no vaccines available to protect your horse against this disease, so careful monitoring and biosecurity measures are essential to reduce the risk of exposure.