Western Equine Encephalomyelitis

This annual vaccination for all horses is strongly recommended.

Western equine encephalomyelitis (WEE) is a viral disease that can attack your horse’s nervous system. The risk of exposure to the virus varies from year to year with changes in the distribution of mosquitoes as well as birds and rodents that serve as virus reservoirs, but all horses are potentially at risk.

TRANSMISSION: Infected mosquitoes

CLINICAL SIGNS: Loss of appetite, fever, depression, head pressing, teeth grinding, circling, blindness and seizures. Surviving horses often have residual mental dullness.

FATALITY: Approximately 50% for WEE1

PREVENTION: CORE EQ INNOVATORTM followed by annual spring revaccination prior to mosquito season


1 American Association of Equine Practitioners. Vaccination Guidelines. 2012. http://www.aaep.org/info/vaccination-guidelines. Accessed November 30, 2016.


January 08, 2020 | ,
Contracting Eastern equine encephalomyelitis (EEE), Western equine encephalomyelitis (WEE) and West Nile virus is a major concern.