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Spatial Risk Factors for West Nile Virus Positivity in Mosquitoes in Indiana State PowerPoint Presentation
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Krishna Thakur Hu Suk Lee . Spatial Risk Factors for West Nile Virus Positivity in Mosquitoes in Indiana State. Outline. Introduction GIS questions? Objectives Materials and Methods Results Discussion Conclusions. What is WNV?.

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Presentation Transcript
outline
Outline
  • Introduction
  • GIS questions?
  • Objectives
  • Materials and Methods
  • Results
  • Discussion
  • Conclusions
what is wnv
What is WNV?
  • West Nile virus (WNV) is a Flavivirus which causes neurological disease in humans, horses and other animals
  • Birds develop substantial viremia and are considered a major reservoir host
  • Humans and horses are dead-end hosts
  • WNV was first detected in 1999 in the United States (New York State)
transmission by mosquitoes
Transmission by Mosquitoes
  • WNV is an Arbovirustransmitted by several mosquito species
    • Most important vector: Culex spp.
  • Mosquito abundance is associated with environmental and anthropogenic factors
    • Standing Water
    • Vegetation overgrowth
    • Urbanization
    • Host population (Humans and Horses)
gis question
GIS question?
  • Why some of the counties in Indiana State have high positive cases of mosquitoes for WNV compared with other counties?
objectives
Objectives
  • Use GIS to compare counties in Indiana in terms of high and low positive cases of WNV to
    • Human population density
    • Horse population density
    • Percent of wetland
    • Percent of urban
    • Percent of different types of land uses
  • Identify areas with high risk and make a risk map for WNV in Indiana using Ordinary least square regression model(OLS)
materials
Materials
  • Data sources
    • WNV mosquito cases by county in Indiana State in 2010

http://diseasemaps.usgs.gov/wnv_in_mosquito.html

    • Indiana State map by county from Statewide

danpatch.ecn.purdue.edu\asm540\data\tippecanoe\statewide

    • Wetland Data

http://inmap.indiana.edu/dload_page/hydrology.html

    • Land cover

danpatch.ecn.purdue.edu\asm540\data\tippecanoe\landcover

materials1
Materials
  • Data sources
    • Human population (Census block)

http://inmap.indiana.edu/dload_page/demographics.html

    • Horse population

http://www.ces.purdue.edu/extmedia/ID/ID-320-W.pdf

    • Census urban Area

danpatch.ecn.purdue.edu\asm540\data\tippecanoe\statewide

    • Other related references
methods1
Methods
  • Normalization by area of county
    • Human population
    • Horse population
    • Area of wetland
    • Area of land use type
  • Recombination and reclassification
    • Forest= Deciduous + Evergreen + Mixed
    • Wetland= Herbaceous + Woody
methods2
Methods

FINAL MODEL

methods3
Methods
  • Normalization by area of county
    • Human population
    • Horse population
    • Wetland area
    • Land cover values
  • Reclassification and recombination of Land cover values
    • Forest= Deciduous + Evergreen + Mixed
    • Wetland= Woody wetland+ Emergent herbaceous wetland
discussion
Discussion
  • WNV cases in mosquitoes are related with
    • Human density
  • This model explains 28% of variation in WNV cases in mosquito indicating some variables are still missing in the model
  • Predicted cases are not spatially autocorrelated indicating random pattern and model significance
discussion1
Discussion
  • GIS
    • OLS tool and Spatial correlation tool work well in comparing and modeling multiple spatial factors
    • Good Visualization tool to understand the distribution of disease and associated risk factors
    • Useful to obtain spatial data for other studies
conclusion
Conclusion
  • Required more factors in order to explain the WNV cases in mosquito
  • Obtained data can be analyzed using robust statistical software
  • Helpful to design mosquito control program
  • Acquaintance with GIS application in spatial epidemiology