Image: West nile virus cases US 2002
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Description: Map showing states and counties where testing for West Nile virus was submitted to the CDC and locations of confirmed cases. States shaded grey did not submit data.
Title: West nile virus cases US 2002
Credit: http://diseasemaps.usgs.gov/2001/usa_human_mar_04.html
Author: United States Geological Survey
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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