Seventy-four horses housed at the Parx Casino racetrack in Bensalem were quarantined earlier this week after one horse tested positive for a type of equine herpes virus, according to the Pennsylvania Department of Agriculture.
The horses, located in barns 19 and 32 of the racetrack, were quarantined Saturday as a precautionary measure. Officials said Tuesday that, while no other horses had shown signs of illness, they had been exposed to the positive horse during the past several weeks.
The affected horses must be kept separate from the rest of the track for at least 21 days before the quarantine can be lifted, according to the agriculture department.
Officials said Equine Herpesvirus Type 1, for which the horse tested positive, can manifest in respiratory or neurological impairment and is, in most cases, only mildly contagious. The virus does not pose a threat to human health.