The New Jersey Department of Agriculture (NJDA) has quarantined a second Colts Neck horse farm as part of its investigation into an outbreak of the neurologic form of equine herpesvirus (EHV-1), that has led to the death of one horse and sickened five others.

The disease was discovered by a private veterinarian treating a sick horse at Overbrook Farm in Colts Neck, N.J. The veterinarian euthanized the filly on April 13 after she failed to respond to treatment. The five other affected horses are responding to treatment and recovering from their illnesses.

The NJDA’s tracing activities at the farm to determine the extent of the outbreak led to today’s quarantine of Tourelay Farm, also in Colts Neck. No confirmed cases of EHV-1 have been reported at Tourelay Farm at this time.

The index farm, Overbrook Farm, was quarantined late last week. Under this quarantine farm personnel must utilize biosecurity measures, such as disinfectant foot baths, coveralls, disposable gloves, hand washing and disinfectant hand gels, and non-sharing of tack between horses. The quarantine is expected to last 21 days, unless more horses become ill. All quarantines are based on risk assessment