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

"On Sept. 10, 2012, the CDFA Animal Health Branch confirmed one additional case of WNV in an unvaccinated 4-year-old gelding located in Sacramento County," the statement read. "The horse was euthanized."

The Sacramento County gelding is the eleventh California horse to test positive for WNV in 2012. The nine other cases were identified in Butte, Fresno (2), Glenn, Merced, Sacramento, San Joaquin (2), Stanislaus, and Yolo counties. Four of the positive horses have been euthanized, the CDFA reports.

"The CDFA continually monitors and investigates equine neurologic cases for the presence of WNV in California," the statement read. "The CDFA urges horse owners to consult their veterinarian concerning a WNV vaccination program to ensure maximum protection of their horses

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