EEE, WEE, WNV and even neurological disease associated with EHV-1 would be considerations in any nuerological horse. Was the horse current on vaccinations for the first 3 on the list? That would help rule them out. There is not vaccination that will prevent the neurological form of EHV-1. Is the horse dribbling urine or having other urinary difficulties?
Licensed Veterinary Technician