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Int. J. Environ. Res. Public Health 2010, 7(2), 494-508; doi:10.3390/ijerph7020494
Article

Hydrologic Conditions Describe West Nile Virus Risk in Colorado

1,* , 2
 and 3
Received: 10 December 2009; Accepted: 9 February 2010 / Published: 11 February 2010
(This article belongs to the Special Issue Climate Change and Human Health Impacts and Adaptation)
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Abstract: We examine the relationship between hydrologic variability and the incidence of human disease associated with West Nile virus (WNV; family Flaviviridae, genus Flavivirus) infection (hereafter termed “human WN cases”) in Colorado from 2002 to 2007. We find that local hydrologic conditions, as simulated by the Mosaic hydrology model, are associated with differences in human WN cases. In Colorado’s eastern plains, wetter spring conditions and drier summer conditions predict human WN cases. In Colorado’s western mountains, drier spring and summer conditions weakly predict human WN cases. These findings support two working hypotheses: (1) wet spring conditions increase the abundance of Culex tarsalis vectors in the plains, and (2) dry summer conditions, and respondent irrigational practices during such droughts, favor Cx. pipiens and Cx. tarsalis abundance throughout Colorado. Both of these processes potentially increase the local vector-to-host ratio, favoring WNV amplification among competent avian hosts and bridging to humans.
Keywords: West Nile Virus; hydrology; transmission; amplification; spatial autocorrelation; Culex mosquitoes West Nile Virus; hydrology; transmission; amplification; spatial autocorrelation; Culex mosquitoes
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Shaman, J.; Day, J.F.; Komar, N. Hydrologic Conditions Describe West Nile Virus Risk in Colorado. Int. J. Environ. Res. Public Health 2010, 7, 494-508.

AMA Style

Shaman J, Day JF, Komar N. Hydrologic Conditions Describe West Nile Virus Risk in Colorado. International Journal of Environmental Research and Public Health. 2010; 7(2):494-508.

Chicago/Turabian Style

Shaman, Jeffrey; Day, Jonathan F.; Komar, Nicholas. 2010. "Hydrologic Conditions Describe West Nile Virus Risk in Colorado." Int. J. Environ. Res. Public Health 7, no. 2: 494-508.



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