Elevated West Nile Virus Activity Detected in North Central Orange County

The Orange County Mosquito and Vector Control District (OCMVCD) has detected elevated West Nile Virus (WNV) activity in North Central Orange County.

OCMVCD routinely traps mosquitoes to test for the presence of mosquito-borne disease and monitor mosquito abundance. If the areas continue to have high WNV activity, OCMVCD may conduct adult mosquito control applications.

WNV occurs in a natural cycle between mosquitoes (vectors) and vertebrates (reservoirs), with humans becoming involved during WNV outbreaks. The virus also affects wildlife, with some species (crows and horses) being extremely vulnerable to infection. Human cases resulting in encephalitis and fever caused by the virus are not usually transmitted person-to-person, but largely through the bite of a competent mosquito vector.

Symptoms of WNV include flu-like symptoms associated with fever, nausea, headache, muscle aches, and occasional skin rashes. If you observe any of these symptoms, please contact your healthcare provider immediately. Severe cases of WNV can exhibit loss of coordination, delirium, coma, and death. Only 5% of severe cases result in fatality.

Although mosquito activity typically declines during October, recent rains and elevated temperatures mean WNV activity could continue into Fall.

To prevent mosquito bites, OCMVCD recommends the following:

Wear repellent containing DEET, Picaridin, IR3535, or oil of lemon eucalyptus
Close all unscreened doors and windows to prevent mosquitoes from entering your home or space; repair broken or damaged screens
Wear light-colored, loose-fitting, long-sleeved shirts, and long pants while outside at dawn and dusk
Dump and drain containers holding water at least once a week
Clean and scrub bird baths and pet water bowls

For more information, please visit www.ocvector.org or contact Public Information Officer Brian Brannon at (714) 971-2421, ext. 7112.

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