The number of horses that have tested positive for equine herpesvirus-1 (EHV-1) at Sunland Park racetrack, in New Mexico, continues to rise, while officials in Arizona report that one horse euthanized after developing neurologic signs was confirmed positive for the virus.

In a Jan. 30 update, the New Mexico Livestock Board reported that 28 horses have now tested positive for EHV-1 on nasal swab and/or whole blood testing.

“These horses are from 17 different barns within Sunland Park racetrack; at present, horses in surrounding areas have tested negative,” the board’s statement said. “Of these 28, four horses have been euthanized for progressive neurologic signs. No movement of horses is being allowed in or out of Sunland Park.”

Meanwhile, official in Arizona also released an update on Jan. 30 via the Equine Disease Communication Center on the potential EHV-1 cases at Turf Paradise racetrack

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