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West Nile Virus

West Nile Virus. Luisa Godfrey Darin Hansen Morgan Poll Corey Kaminska. Background Information. Virus of the Flaviviridae family Name stems from flavus means yellow in Latin. Background Information. Structure similar to the dengue fever. Enveloped, spherical virion , 40 - 50 nm

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West Nile Virus

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  1. West Nile Virus Luisa Godfrey Darin Hansen Morgan Poll Corey Kaminska

  2. Background Information • Virus of the Flaviviridae family • Name stems from flavus means yellow in Latin

  3. Background Information • Structure similar to the dengue fever. • Enveloped, spherical virion, 40 - 50 nm • Linear • Positive polarity • Infectious

  4. Background Information • Discovered in Uganda in 1937 • West Nile District • Characterized in 1953 in Egypt and Israel

  5. Background Information • Arrived in New York in….....? 1999

  6. Occurrence • Person • Place • Time

  7. Factors and Interactions • WNV is an arthropod borne virus • Asian Tiger Mosquito is the vector of WNV

  8. Factors and Interactions • Mosquito species vary according to geography • In Utah the primary vectors are the Culex Tarsalis and Culex Pipien species

  9. Factors and Interactions • The mosquito life cycle • Egg  larvae  pupae  adult

  10. Factors and Interactions • Requires water temperature above 65 degrees to mature into an adult • Temperatures of 90 and above the mosquito can go from egg to adult in as few as 5 days

  11. Factors and Interactions

  12. Factors and Interactions • WNV is transmitted through the saliva of the mosquito when the proboscis is inserted

  13. Threat Assessment in the US • National surveillance has documented person with WNV illness since 1999

  14. Signs and Symptoms • Most people have no type of illness. • About 20% of the infected get West Nile Fever (Mild symptoms) • 1 in 150 of the infected will get a more severe form of the disease. (West Nile Encephalitis or Meningitis) • Symptoms can take 3 to 14 days to show.

  15. West Nile Fever • Mild Symptoms • Fever • Head and Body aches • Occasional skin rash on trunk of body • Swollen Lymph glands

  16. West Nile Encephalitis or Meningitis • More Severe • Head ache • High fever • Neck stiffness • Disorientation • Coma • Tremors • Convulsion • Muscle Weakness • Paralysis

  17. Diagnosis • Contact your doctor immediately • Risk determined by where you live and have traveled • Blood samples • IgM antibody in cerebrospinal fluid

  18. Treatment • No specific treatment • Hospitalization • Iv therapy (fluids) • Respiratory support

  19. Prevention • Stay indoors at dusk or dawn • Use screens on doors and windows • Wear long sleeve shirts and pants • Use DEET, also apply to clothes • Remove standing water • Avoid touching sick/dead birds

  20. Extra! Extra! • Mosquito Abatement By: Corey

  21. Questions?

  22. West Nile Virus Luisa Godfrey Darin Hansen Morgan Poll Corey Kaminska

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