One additional property in Orange County, Calif., has been placed under quarantine after a 10-year-old Warmblood gelding begin showing neurologic signs. On March 4, the horse tested positive for Equine Herpesvirus Myeloencephalopathy (EHM). Two additional horses on the property tested positive for EHV-1. These cases are not linked to any other current EHM incidents in California.
These cases are in addition to the 19 EHV-1 cases formerly found in one Orange County premise (one with EHM, 18 with fever only) and a second location with eight confirmed EHV cases: two EHM and six with fevers, but no neurologic signs.
The San Mateo County EHV outbreak location has had two additional EHV positive cases. In total, three EHM cases and 30 EHV-1, fever only cases have been confirmed.
In Riverside County, three additional horses on the index premise have displayed fevers and were confirmed with EHV-1. These horses are housed outside of the index barn that has been quarantined. To date, there have been three confirmed EHM cases and 30 confirmed EHV-1 cases with fever only at this location.
In LA County, there has been one confirmed case of EHM.
Notes: All premises are under an official quarantine, which will be lifted when all EHV positive horses have two consecutive negative tests seven days apart.
Get an EHM fact sheet here.
Get additional information at the Equine Disease Communication Center.
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