Image: West nile virus case in United States 2006
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Description: Map of the United States showing confirmed cases of West Nile virus infection in 2006. Cumulative 2006 Data as of 3 am, May 01, 2007
Title: West nile virus case in United States 2006
Credit: http://diseasemaps.usgs.gov/2006/wnv_us_human.html
Author: United States Geological Survey
Usage Terms: Public domain
License: Public domain
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