Source:
California Department of Food and Agriculture
Number Confirmed: 1 Number Exposed: 26 Facility Type: Training Facility Age: 9; Gender: Mare; Breed: Quarter Horse (QH); Usage: Reining; Onset of Clinical Signs: 2/22/2023Clinical Signs: Acutely recumbent and unable to rise, afebrile. Confirmation Date: 2/27/2023; Horse Status: Euthanized; Vaccination Status: UndervaccinatedComments: A 9-year-old Quarter Horse mare in San Luis Obispo County displaying acute neurological signs was confirmed positive for Equine Herpesvirus Myeloencephalopathy (EHM) secondary to Equine Herpesvirus-1 on February 27th. She became acutely neurological on February 22nd, and was subsequently euthanized due to severity of clinical signs. The mare had recently attended a large western discipline event in Tarrant County, Texas from February 10 – 20th, with no clinical signs observed during the event or travel. Event management and Texas state animal health officials have been notified, and all horses attending this event are recommended to monitor temperatures twice daily for 14 days following their departure from the event grounds, and to contact their veterinarian with any concerns. Twenty-six (26) potentially exposed horses on the mare’s home premises have been quarantined, and CDFA was onsite for site assessment and assistance with implementation of enhanced biosecurity measures. CDFA will continue to actively monitor the situation. For more information and updates, go to https://www.cdfa.ca.gov/ahfss/Animal_Health/equine_herpes_virus.html
For additional information, go to https://www.equinediseasecc.org/equine-herpesvirus