I hope they have controlled for the density of the human population 
around each of their study plots.  I couldn't tell from the Science 
Daily page whether they had or not.

James and Ann Nelson wrote:
> You may find this interesting.  A study by biologists at Washington 
> University in St. Louis shows that the more diverse a bird population 
> is in an area, the less chance humans have of exposure to West Nile 
> Virus.
>
> You can read about the study here:
> http://www.sciencedaily.com/releases/2008/10/081006180811.htm
>
> Jim Nelson
> Bethesda, MD
>


-- 
Maurice Barnhill 
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Department of Physics and Astronomy
University of Delaware
Newark, DE 19716