Outbreaks | Equine Disease Communication Center

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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West Nile Virus

Ventura County, CA

Alert ID: 361

November 10, 2016

On November 10, 2016, an unvaccinated 17-year old Arabian mare in Ventura County, displaying neurologic signs was confirmed positive for West Nile Virus (WNV). The mare is recovering. A total of twenty one (21) horses have been confirmed positive for WNV and are located in the following counties; Calaveras, Fresno(2), Merced, Riverside, Sacramento(3), San Diego, San Joaquin(7), Shasta, Sutter(2) and Ventura(2) counties. Eighteen of the positive horses were not current on their WNV vaccinations and two horses had unknown vaccination status. Seven of the twenty one positive confirmed horses died or were euthanized. CDFA continually monitors and investigates equine neurologic cases for the presence of WNV in California. CDFA urges horse owners to consult their veterinarian concerning a WNV vaccination program to ensure maximum protection of their horses. For additional information visit : https://www.cdfa.ca.gov/ahfss/animal_health/WNV_Info.html

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