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Photograph / Copyright USGS
Reported occurrence of West Nile virus in Sentinels in the USA during 2007. Accessed from the USGS website.

"These maps reflect information for the 2007 West Nile Virus reporting season that has been submitted and verified to CDC through the week of April 1, 2008. These are NOT considered the final USGS West Nile maps for the 2007 season." (W184.May08.w26)