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Photograph / Copyright USGS
Reported occurrence of West Nile virus in animals other than birds (mainly horses) in the USA during 2005. Accessed from the USGS website.

"These maps reflect information for the 2005 West Nile Virus reporting season that has been submitted and verified to CDC through the week of May 5, 2006. These are the final USGS West Nile maps for the 2005 season."