The California Department of Food and Agriculture (CDFA) has reported that a polo pony euthanized after developing neurologic signs tested positive for equine herpesvirus-1 (EHV-1).

“A 14-year-old polo mare, in Riverside County, displaying acute onset neurologic signs was euthanized on Sunday, Feb. 7,” the CDFA said in a Feb. 9 statement. “The necropsy results from the California Animal Health and Food Safety Laboratory on Feb. 9 confirmed the non-neuropathogenic strain of EHV-1.”

The CDFA noted that 70 exposed horses have been placed under quarantine with required twice daily temperature monitoring.

“At this time, no additional horses are displaying clinical signs,” the department’s statement said. “All exposed horses will be monitored for clinical signs and fever for 14 days post-exposure. Enhanced biosecurity measures have been implemented and immediate isolation protocols for any horse with a temperature over 102$deg;F, or compatible clinical signs, are in place