Kentucky Reports Equine Neurologic Herpesvirus Case A 3-year-old Thoroughbred filly in Woodford County, Kentucky, has tested positive for the neuropathogenic strain of EHV-1. Author: Mar 11, 2021 A 3-year-old Thoroughbred filly in Woodford County, Kentucky, has tested positive for the neuropathogenic strain of EHV-1. iStock Equine herpesvirus myeloencephalopathy (EHM, also known as neurologic equine herpesvirus) has been confirmed in a 3-year-old Thoroughbred filly in Woodford County, Kentucky. The filly reportedly had a fever on Saturday and was referred to a veterinary hospital in Lexington on Tuesday evening after becoming unstable and ataxic. The Kentucky State Veterinarian's Office was alerted of the suspected equine herpesvirus case on Tuesday night, and the training facility was placed under restriction pending completion of diagnostic testing.