Having identified the first known racehorse to die from the West Nile Virus (WNV) at a California racetrack, equine health authorities are emphasizing the importance of equine vaccinations and booster shots as well as other preventive measures to help prevent the spread of the disease.

The California Animal Health and Food Safety Laboratory at the University of California, Davis, confirmed Aug. 13 that the 5-year-old mare Quick Nip, who was euthanized Aug. 10 at Golden Gate Fields in Berkley, was infected with WNV. The California Horse Racing Board is attempting to determine the vaccination history of Quick Nip, who was claimed twice in her 20-race career and had several owners.

“Two excellent weapons that we have against this disease are mosquito control and two USDA fully licensed equine vaccines,” explained Annette Whiteford, DVM, director of Animal Health & Food Safety Services with the California Department of Food and Agriculture. “The two USDA approved vaccines have been demonstrated to provide a high level of protection when used in accordance with the manufacturer’s recommendations. We urge horse owners to consult with their veterinary practitioners to make certain that the vaccination status of their horse is current