RETAINING POND SPRAYED FOR SUSPECT MOSQUITO LARVAE.
John Kotches of the Orange County Mosquito Control Department, sprays suspect mosquito larvae as part of the county's efforts to control mosquitoes carrying the West Nile virus in Orlando, Florida August 7, 2002. Mosquito control agencies across the state are increasing efforts to battle the spread of the virus, which has killed a fifth person in Louisiana. Reuters

A West Nile virus case has been confirmed in California's Contra Costa County, prompting local health officials to warn residents about taking preventative measures.

The patient, a 49-year-old woman in the eastern part of the county, is the first West Nile virus case in the state this year, according to local health officials, the Contra Costa Times reported.

Although West Nile virus can be a serious disease, most people who become infected with the virus do not develop symptoms, Contra Costa Health Services Communicable Disease Nurse Manager Susan Farley said in a statement. It is important to remember that West Nile virus is preventable and is only spread from the bite of a mosquito.

Farley gave residents instructions on preventative measures, which included reporting dead birds to the state.

The Centers for Disease Control and Prevention (CDC) recommend that people apply insect repellant and wear clothing that covers the arms and legs.

The health organization also recommends getting rid of any stagnant water in the area. This includes emptying kiddie pools of water when they are not in use.

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