Ontario Reports Two Confirmed Cases of EHM in Durham Region

Three other horses from the same farm tested positive for EHV-1 but are not showing neurologic signs at this time.

No account yet? Register


The Ontario Ministry of Agriculture, Food, and Rural Affairs (OMAFRA) has been notified of two confirmed cases of equine herpes myeloencephalopathy (EHM), a neurologic disease caused by equine herpesvirus-1 (EHV-1).

The horses from Durham Region were referred to the University of Guelph’s Ontario Veterinary College with neurologic signs and are receiving treatment. Three other horses on the farm have tested positive for the mutated (neuropathogenic) strain of EHV-1 on nasal swabs but are not demonstrating neurologic signs at this time. The farm owner has voluntarily placed the premises under quarantine to reduce the risk of viral spread.

These are the first cases of EHM diagnosed in Ontario this year; however, cases of EHM have been diagnosed in California, Kentucky, Louisiana, and Michigan since the beginning of the year. In 2015, there were three laboratory-confirmed cases of EHM in Ontario

Equine herpesvirus-1 infection can cause respiratory disease, abortion, neonatal foal death, and/or neurologic disease in horses. It is not a federally reportable disease, but is immediately notifiable by laboratories under the reporting regulation of the provincial Animal Health Act. Attending veterinarians suspicious of EHM should contact OMAFRA as soon as possible

Create a free account with TheHorse.com to view this content.

TheHorse.com is home to thousands of free articles about horse health care. In order to access some of our exclusive free content, you must be signed into TheHorse.com.

Start your free account today!

Already have an account?
and continue reading.


Written by:

Related Articles

Stay on top of the most recent Horse Health news with

FREE weekly newsletters from TheHorse.com

Sponsored Content

Weekly Poll

sponsored by:

When do you begin to prepare/stock up on products/purchase products for these skin issues?
122 votes · 122 answers

Readers’ Most Popular

Sign In

Don’t have an account? Register for a FREE account here.

Need to update your account?

You need to be logged in to fill out this form

Create a free account with TheHorse.com!