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Disease Alerts

Updates on current disease outbreaks are listed here as they occur and will include the date listed, disease name, location and current status. Specific premises will not be named but the general location by town, county and state will be listed. When locations, events or horses are at risk they will be listed. Updates will be posted as they are received.



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San Joaquin Counties, CA
Alert ID: 52
June 24, 2015

June 18, 2015: A 13 year old Quarter Horse mare residing in San Joaquin County was confirmed positive for Equine Herpes Myeloencephalopathy (EHM). This mare did not attend Mule Days in Bishop, CA from May 17-26, 2015 but was exposed to two cohort mules after they arrived home from Mule Days. The mules were asymptomatic for EHV-1. The QH mare exhibited symptoms compatible with EHV-1 beginning on June 5th including lethargy, fever, stocking up of her hind limbs and severe incoordination in her hind limbs. The mare was euthanized on June 14th. She did test positive for the neuropathogenic strain of EHV-1. The affected premises is home to 10 horses and mules and at this time there are no other affected equids on this property. The owner has been monitoring temperatures 2X/day on all of the horses and mules. This mare had not received any EHV-1 vaccinations in the past two years. This premises is under CDFA quarantine.