Image: West Nile virus map United States 2012 outbreak
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Description: Map of the United States showing counties where West Nile virus infections have been reported. Final data from May 3, 2013.
Title: West Nile virus map United States 2012 outbreak
Credit: http://diseasemaps.usgs.gov/wnv_us_human.html
Author: United States Geological Service
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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