A California polo horse confirmed with the equine herpesvirus (EHV-1) has been euthanized. The state has ordered the quarantine of a Riverside County boarding stable.
The California Department of Food and Agriculture states a 14-year old polo mare was euthanized on Sunday, February 7, after displaying acute onset neurologic signs. A necropsy confirmed the non-neuropathogenic strain of EHV-1 the next day.
According to the state, all 70 horses stabled at the polo facility are quarantined for 14 days. Biosecurity measures have been implemented at Empire West stabling at Empire Polo.
CDFA is conducting an epidemiologic investigation to try to identify potentially exposed horses.
EHV-1 is a highly contagious virus that causes respiratory disease, abortion, and intermittent outbreaks of neurologic disease in horses.
Symptoms that should alert horse owners to the possibility of EHV-1 include fever, weakness, incoordination, and urine dribbling or inability to urinate. Horses with these symptoms should be examined immediately by a veterinarian.
Suspect horses should be isolated from healthy horses.
An outbreak continues to grow in New Mexico with 61 confirmed cases. Nine horses have been euthanized. The cases are not believed to be related, according to California officials.