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Photograph / Copyright USGS
Reported occurrence of West Nile virus in Sentinels in the USA during 2004. Accessed from the USGS website.

"These maps reflect information for the 2004 West Nile Virus reporting season that has been submitted and verified to CDC through the week of January 11, 2005. These are the final USGS West Nile maps for the 2004 season." (W184.May08.w26)