The California Department of Food and Agriculture (CDFA) confirmed one additional case of equine West Nile virus (WNV) on Friday (Aug. 3), according to a statement on the organization’s website.

"On August 3, 2012, the CDFA Animal Health Branch confirmed one additional case of West Nile virus in a 3-year-old unvaccinated filly in Fresno County," the statement read. "The filly is recovering."

The Fresno County filly is the fourth California horse to test positive for WNV in 2012. The three other positive cases were identified in Glenn, San Joaquin, and Stanislaus counties. Only one of the four horses has been euthanized to date.

In a blog post published July 31, California State Veterinarian Annette Whiteford, DVM, said, "Each year, we find ourselves using this sad occasion to remind horse owners to have their animals vaccinated. It offers them maximum protection against the disease. And once vaccinations occur, horse owners should be checking regularly with their veterinarians to make sure they stay current

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