According to an update from the Equine Disease Communication Center, the quarantine at Parx Racing was released on March 26 after no new horses showed any signs of equine herpesvirus (EHV).
The track had closed its gates to shippers in and out in early March after one horse was euthanized and later tested for EHV. Several neighboring racetracks had also issued bans on horses that had been at Parx.
Two barns were quarantined at that time.
The EDCC update indicated that the index horse was removed from its barn quickly at the onset of symptoms and none of the quarantined horses have since shown any symptoms of the illness.
EHV is a highly contagious respiratory illness which can sometimes result in neurological symptoms. Neurological cases of EHV carry an increased risk of fatality.
Read more about what's known and what remains unknown about this illness in this 2016 reporting from the Paulick Report and from this AAEP fact sheet.
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