Image: West Nile virus cases in United States 2013
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West_Nile_virus_cases_in_United_States_2013.png (580 × 482 pixels, file size: 24 KB, MIME type: image/png)
Description: US counties with reported West Nile virus infections in 2013, as of May 07, 2014. Pink = Positive test result for a resident
Title: West Nile virus cases in United States 2013
Credit: http://diseasemaps.usgs.gov/2013/wnv_us_human.html
Author: U.S. Department of the Interior U.S. Geological Survey
Usage Terms: Public domain
License: Public domain
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