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West Nile Virus

West Nile Virus . Marion County Environmental Health’s Vector Control Program 503-588-5346. 1. 2. Mosquito Surveillance 2005 Vector Control Districts. Existing VCD. Proposed VCD. 3. 4. 5. 6. Trends in Human Cases. * with human cases. 7.

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West Nile Virus

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  1. West Nile Virus • Marion County Environmental Health’s • Vector Control Program • 503-588-5346 1

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  3. Mosquito Surveillance 2005 Vector Control Districts Existing VCD Proposed VCD 3

  4. 4

  5. 5

  6. 6

  7. Trends in Human Cases * with human cases 7

  8. Most people who get sick from WNV infection have WNV fever Time from exposure (usually by mosquito bite): 3-14 days Fever, chills, headache, fatigue Can be severe Nausea, vomiting (can be severe) Rash, usually not itchy, lasting a few days, mainly on chest, back, abdomen, and/or arms Usually better within a week, though persistent headache, fatigue common -- reports of weeks, even longer among otherwise healthy persons Spectrum of Illness - West Nile Fever 8

  9. What Can You Do? 9

  10. Wear repellent when outdoors. • Avoid being outdoors from dusk to dawn. • Wear long sleeve shirts and pants. • Clean your roof gutters, empty buckets and kiddy pools. Properly dispose of tires or drill holes in them. • Change the water in birdbaths and pet waterers at least weekly. • Keep ponds free of vegetation 10

  11. Source Reduction 11

  12. Source Reduction 12

  13. Other Ways to Protect Yourself 13

  14. DEET Effectiveness * with 2% soybean oil 14

  15. Native to Southern US Effective in small ponds, ornamental pools Effective in livestock water troughs Eat the mosquito larvae Available in pet stores at very low cost Gambusia affinisMosquito Fish 15

  16. Gambusia affinisMosquito Fish • Can not be used in rivers, creeks, lakes • Can not be taken across county borders without ODFW Transport Permit • Do not use where they can escape into open waters • Fish are live-bearers and reproduce rapidly • Effective in shallow water with vegetation • Concerns about predation of native species 16

  17. What Can Marion County DO? 17

  18. Marion County will collect dead crows and jays for WNV testing • Marion County will identify and survey adult mosquitoes for WNV • Marion County will speak to civic organizations, schools, etc. • Marion County will provide information to the public through pamphlets, handouts and the internet • Marion County will cooperate with cities on controlling mosquito larvae 18

  19. Marion County will survey property for owners and consult with them on control measures. • Marion County will do limited larvaciding in areas of the county where high-risk populations are located. • Marion County will use the safest most efficient pesticide for larvae control. • Marion County will use Bacillus thurengiensis (bacteria) and Methoprene (growth regulator) • Marion County will provide information on where to obtain Gambusia affinis 19

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  22. Marion County Environmental Health503-588-5346 22

  23. West Nile Virus 2005 West Nile in the West and U.S.

  24. West Nile Virus in 2005 in the U.S.

  25. Birds with WNV in California As of July 22, 2005

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