The Pennsylvania Department of Agriculture reported to the Equine Disease Communication Center on May 17 that one horse was positive for neurologic herpesvirus in Chester County. The horse was reported to have suffered from neurologic deficits, but is alive.

The report noted that the horse remains on its home premises, a private equestrian facility in Chester County, Pennsylvania. The premises has been quarantined by the Pennsylvania Department of Agriculture, Bureau of Animal Health. The index case had not left the premises for more than three weeks and was placed in strict isolation immediately when clinical signs were recognized. All horses on the premises are being monitored for clinical signs of EHV-1 infection, and biosecurity precautions have been implemented to prevent the spread of the virus.