TRENTON, N.J. — The New Jersey Department of Agriculture has quarantined a Warren County farm after a 22-year-old horse developed the highly infectious equine herpes myeloencephalopathy.
EHM is the often deadly, neurologic form of Equine Herpes Virus, or EHV-1, infection. The horse had not left the premises in years.
The thoroughbred mare was euthanized on March 31 after it had a rapid progression of neurological signs typical of the disease and subsequently tested positive for EHV-1. There are a number of other horses present at the farm, none of which have shown signs of the disease.
This is the third case of EHM in New Jersey this year. An EHM-positive horse in Somerset County prompted quarantines at two farms in January, and two other farms were quarantined in February due to a sick horse in Gloucester County. No other horses in the two unrelated cases showed signs of the illness and the quarantines were lifted after 21 days of quarantine.