WNV in California Horses: Case Confirmed in Sacramento County

A yearling Grade filly with unknown vaccination history began displaying neurologic signs. She tested positive for WNV and was euthanized.
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wnv in california
West Nile virus is transmitted to horses via bites from infected mosquitoes. | Photo: iStock

California animal health officials have confirmed another equine case of West Nile virus (WNV). So far this year, there have been 11 confirmed cases of WNV in California horses.

“On Nov. 2, 2018, a 1-year-old Grade mare in Sacramento County with unknown vaccination history, displaying neurologic signs was confirmed positive for West Nile virus,” the California Department of Food and Agriculture (CDFA) said in a statement on its website. “The mare was euthanized due to severity of clinical signs

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Erica Larson, former news editor for The Horse, holds a degree in journalism with an external specialty in equine science from Michigan State University in East Lansing. A Massachusetts native, she grew up in the saddle and has dabbled in a variety of disciplines including foxhunting, saddle seat, and mounted games. Currently, Erica competes in eventing with her OTTB, Dorado.

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