Heather Hirst, DVM, MS, Delaware State Veterinarian, announced Dec. 8 that PCR test results from the University of Kentucky confirm that a Standardbred horse in Kent County has tested positive for equine herpesvirus-1 (EHV-1), a highly infectious viral disease of horses.

The horse showed signs of illness on Dec. 3 and blood and nasal swab samples were sent to the University of Kentucky immediately for analysis. The horse’s clinical signs progressed and it was euthanized at the facility on Dec. 7. Early clinical signs of the neurologic form of EHV include fever (101.5° F or higher) and ataxia (incoordination). The respiratory form of the disease may or may not precede the neurologic form. The virus is spread most commonly via infectious respiratory secretions, but may also be carried on contaminated equipment, clothing, and hands of personnel.

The horse had no record of racing, qualifying, or training at Dover Downs. The Delaware Harness Racing Commission is conducting a thorough investigation of this matter in conjunction with the Delaware Department of Agriculture. The State Veterinarian’s Office and the owners of the horse implemented biosecurity measures and protocols to prevent the spread of the disease into Delaware’s equine community on Dec. 6.

The quarantine will be in effect for a minimum of 21 days past the conclusion of the most recent case of EHV on the farm. After 21 days with no clinical signs, a state official or Delaware Department of Agriculture-designated veterinarian will perform diagnostic tests and evaluate the clinical status of each horse on the quarantine premises