Samples were collected on the Old Bolsa Chica Road in Westminster and in the Dale and Orange Alley areas of Anaheim, according to the Mosquito District and Control Vector.
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The viral disease is spread to humans by a mosquito bite carrying SLE. Once infected, symptoms include fever, nausea, vomiting and fatigue. The disease can also cause brain swelling and in some rare cases, long-term disability or even death, health officials say.
No human infection cases have been confirmed, but residents of Orange County are urged to take precautionary measures to prevent mosquito bites.
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"The best way to prevent mosquito bites is to throw away any standing water around your home to eliminate potential sources breeding, "agency spokesman Heather Highland said in a press release.
Wearing mosquito repellent shirts and long sleeves and long pants while outside are also effective ways to avoid bits.
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