Image: West nile virus case in United States 2007
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Description: West Nile virus case in United States in 2007. Cumulative 2007 Data as of 3 am, May 20, 2008 National Cumulative Human Disease Cases:3630
Title: West nile virus case in United States 2007
Credit: http://diseasemaps.usgs.gov/2007/wnv_us_human.html
Author: USGS
Usage Terms: Public domain
License: Public domain
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