Following the recent death of one horse stabled at Suffolk Downs, in East Boston, Massachusetts, from equine herpesvirus myeloencephalopathy (EHM), no horses are being allowed to leave the track, although no official quarantine has been imposed.

The affected horse died at the Tufts University School of Veterinary Medicine's equine facility, in North Grafton, Massachusetts, after being transferred from the track.

One other horse at Suffolk Downs grounds has developed a fever. Samples drawn from that horse have been sent to the state laboratory for testing and authorities are awaiting the results.

Jennifer Durenberger, DVM, the director of racing for the Massachusetts Gaming Commission, said, the barn the affected horse resided in "is under enhanced biosecurity measures and we are taking other special measures to protect the horse