New detections of West Nile Virus in California horses – prevention tips from CDFA


A total of five California horses have tested positive in recent weeks for West Nile Virus, all in the Central Valley. One of the horses is deceased, and only one had been vaccinated.

Horse owners are encouraged to have their animals vaccinated to make sure they are maximizing protection against the disease. And once vaccinations occur, horse owners should be checking regularly with their veterinarians to make sure they stay current.

Californians can also do their part to prevent the disease by managing mosquitoes that carry West Nile Virus. Here are some tips:

  • Draining unnecessary standing water found in wheelbarrows, tires, etc.
  • Cleaning water containers at least weekly (i.e., bird baths, plant saucers)
  • Scheduling pasture irrigation to minimize standing water
  • Keeping swimming pools optimally chlorinated and draining water from pool covers
  • Stocking of water tanks with fish that consume mosquito larvae (Contact local mosquito control for assistance) or use mosquito “dunk” available at hardware stores.

It’s important to remember that mosquitoes become infected with the virus when they feed on infected birds. Mosquitoes then spread the virus to horses.  Horses are a dead-end host and do not spread the virus to other horses or humans. For more information on West Nile Virus, please visit this link.

About Kevin

Manager of Mainframe Operations and Optimization – USS-UPI, Co-Founder and Board Member - Friends of Oakley A Community Foundation, Trustee RD 2137, Advisory Board – Opportunity Junction
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