West Nile Virus


Public Health DivisionHealth and Human Services Agency


Información sobre el Virus del Nilo Occidental

West Nile Virus Fight the Bite

    What can I do to protect myself?

      The best way to avoid becoming sick from WNV is by preventing mosquito bites:

      1. DEFEND– Use an EPA-registered insect repellent with DEET, picaridin, oil of lemon eucalyptus or IR3535 according to label instructions. Repellents keep the mosquitoes from biting you. DEET can be used safely on infants and children 2 months of age and older
      2. DAWN and DUSK – Mosquitoes that carry WNV bite in the early morning and evening. It is important during this time to use repellent and wear clothing that reduces the risk of skin exposure to mosquito bites. Make sure your doors and windows have tight-fitting screens to keep out mosquitoes. Repair or replace screens with tears or holes.
      3. DRAIN – Mosquitoes lay their eggs on standing water. Eliminate all sources of standing water on your property, including buckets, old car tires and pet bowls. If you have a pond, use mosquito fish (available from Napa County Mosquito Abatement District) or commercially available products to eliminate mosquito larvae.


      Know the signs and symptoms of WNV; Talk to your health care provider if you or someone in your care is having severe symptoms. (See Question 7)

        Report dead birds and dead tree squirrels:

        Report Mosquito Problems

        For local problems with mosquito control contact the Napa County Mosquito Abatement District at (707) 553-9610.

        For more information visit the Napa County Mosquito Abatement District website.

          Additional Information and Resources

            California Department of Public Health WNV site: www.westnile.ca.gov

              West Nile Virus Frequently Asked Questions*

              *Information extracted from California Department of Public Health West Nile Website. Please visit their website for in depth information regarding West Nile Virus.   

              1. What is West Nile Virus?
              2. When was WNV first found in the United States?
              3. When was WNV first found in California?
              4. How is WNV detected and monitored in California?
              5. How is WNV transmitted?
              6. How soon do infected people get sick?
              7. What are the symptoms of WNV?
              8. How is WNV infection treated?
              9. What should I do if I think I have WNV?
              10. If you have had WNV are you immune (protected) to further infections?
              11. Who is at greatest risk of getting severely ill from WNV?
              12. Can animals get sick from WNV?
              13. What can a person do to prevent getting sick from WNV?
              14. Can the public assist in detecting WNV by reporting dead birds?
              15. What are state and local agencies doing to reduce the risk of WNV transmission?