Image: West nile virus case in United States 2008
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Description: West Nile virus cases in United States 2008. Cumulative 2008 Data as of 3 am, Apr 09, 2009 National Cumulative Human Disease Cases:1356
Title: West nile virus case in United States 2008
Credit: http://diseasemaps.usgs.gov/2008/wnv_us_human.html
Author: USGS
Usage Terms: Public domain
License: Public domain
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