Michigan Department of Agriculture (MDA) director Dan Wyant today announced the confirmation of a fourth case of equine herpesvirus type-1 (EHV-1) at Northville Downs in Northville, Mich., and the subsequent cancellation of live racing cards through Feb. 14. Under joint authority of MDA and the Office of Racing Commissioner, all restricted areas of the track have been placed under quarantine, prohibiting any horse from entering or leaving the grounds. Northville Downs remains open to conduct simulcast wagering on races from other racing jurisdictions during the cancellation.

On Feb. 8, a sample from the affected horse tested positive for EHV-1 at the state’s Diagnostic Center for Population and Animal Health at Michigan State University. State veterinarians continue to monitor the horse, which represents the fourth case to be found at the track in the past three months. The three previous cases occurred in December and January, resulting in 21-day quarantines of separate barns at the racetrack