Image: West nile virus cases in United States 2011
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Description: West Nile virus cases in the United States 2011. Cumulative 2011 Data as of 3 am, Apr 17, 2012.
Title: West nile virus cases in United States 2011
Credit: http://diseasemaps.usgs.gov/2011/wnv_us_human.html
Author: USGS
Usage Terms: Public domain
License: Public domain
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