On July 25, a 6-year-old Warmblood mare in Sonoma County, CA, tested positive for equine herpesvirus (EHV-1), according to reporting from the California Department of Food and Agriculture. The show horse had been stabled at the Sonoma Horse Park in Petaluma, Calif., prior to her positive test. Though the mare was vaccinated, she was euthanized after becoming recumbent and unable to rise.
Managers of the horse show the mare attended notified all attendees, asking them to take temperatures of horses that had attended the show twice daily and quarantine any horses returning from the show for at least seven days. On the show grounds, 19 horses from the affected mare's barn were removed and quarantined at their home farm; the 18 horses left at the home facility had temperatures taken twice daily and the farm implemented enhanced biosecurity measures.
Six horses at the premises tested positive for EHV-1 and began displaying fever and/or limb edema. One horse, a 15-year-old Warmblood mare, began displaying neurologic symptoms and was moved to isolation at a veterinary hospital for care. A 5-year-old Warmblood gelding that was stabled at the horse show with the euthanized mare tested positive for EHV-1 on July 30 and was isolated at the index premises.
There were seven confirmed cases of EHV-1: two were non-neurologic EHV-1 cases at the showgrounds, a 5-year-old Warmblood gelding and a 14-year-old pony mare. one horse thus far has been euthanized.
Read more at the EDCC.
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