Image: West nile virus cases in United States 2009
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Description: West Nile virus cases in United States 2009. Cumulative 2009 Data as of 3 am, May 04, 2010 National Cumulative Human Disease Cases:720
Title: West nile virus cases in United States 2009
Credit: http://diseasemaps.usgs.gov/2009/wnv_us_human.html
Author: USGS
Usage Terms: Public domain
License: Public domain
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