In many horses, the first or only sign of EHV-1 infection is fever, which can go undetected. | Photo: Stephanie L. Church/The Horse

The California Department of Food and Agriculture (CDFA) confirmed on Oct. 3 that a Shasta County horse tested positive for the neurologic form of equine herpesvirus (EHV-1) and that four horses were exposed.

The positive horse, a 20-year-old Quarter Horse gelding, was quarantined and isolated along with the other exposed horses on its premises. All are under quarantine with enhanced biosecurity protocols, including twice-daily temperature monitoring.

The affected horse attended an event at the Rolling Hills Casino Equestrian Center from Sept. 27-29. Subsequent to his positive test, stabling there has been thoroughly cleaned and disinfected, and the event’s sponsoring organization is notifying membership of the possible exposure