Source:
California Department of Food and Agriculture
Number Confirmed: 6; Number Suspected: 4; Facility Type: Showgrounds; Age: 6; Gender: Breed: Onset of Clinical Signs: Clinical Signs: Hind-end Weakness, limb edema, Nystagmus, Recumbency; Confirmation Date: Horse Status: Vaccination Status: Notes: Update 7/27/21 Original Alert ID- 2139: The eighteen (18) horses from the index case’s origin premises that attended the Sonoma county event returned to their home premises in Sacramento County on Sunday July 25th and are quarantined. The horse in this cohort with a fever on July 24th with tests pending was confirmed positive for EHV-1 and remains isolated at the home premises, and has been afebrile since Saturday July 24th. On Monday July 26th, CDFA staff performed a site visit at the home premises in Sacramento county. One horse on the Sacramento home premises that did not attend the Sonoma county event and previously tested positive for EHV-1 (fever only) became neurologic on Monday July 26th and has been sent to an offsite veterinary hospital for treatment. He is in stable condition and was confirmed negative for EHV-1 on Monday, July 26th. One additional horse at the home premises that did attend the Sonoma County event and has remained afebrile also became neurologic on Monday July 26th and has been sent to an offsite veterinary hospital for treatment, and was confirmed negative for EHV-1 on Monday July 26th. She is currently alive and in stable condition. One additional horse that was housed in the same barn at the Sonoma County event presented with fever and mild neurologic signs on Saturday July 24th and was sent to an offsite veterinary hospital for treatment was confirmed negative for EHV-1 on Monday July 26th. He is currently alive and in stable condition. The three remaining horses in this same barn returned to their home premises on Saturday July 25th and are isolated with temperature monitoring and no fevers or clinical signs have been detected. The total number of confirmed cases in this incident are: 1 (one) confirmed EHM case (EHV-1 positive with neurologic signs), 1 (one) new confirmed EHV-1 case (fever and/or edema) only, with 4 (four) previously presumptive positive EHV-1 cases (fever and/or edema only) that have subsequently retested and confirmed negative. In total, one (1) horse in this incident has been euthanized and the other affected horses are alive and under veterinary care. As of Monday July 26th, there is no evidence of ongoing EHV-1 spread at the Sonoma County facility following removal of all known affected and immediately exposed horses. A complete facility quarantine will not be implemented there unless ongoing disease spread is confirmed. The decision for individuals to attend an event at this premises within this timeframe should be discussed with their veterinarians and will be at the owner’s and/or trainer’s own discretion and risk. CDFA recommends that any horses that attended or are currently attending the Sonoma County event be temperature monitored for at least seven (7) days and are isolated at least thirty (30) feet from other horses when they return to their home properties. CDFA was onsite at the Sonoma County event premises on July 27th, and continues to actively monitor the situation.;