Growth of West Nile Virus in the U.S.

Growth of West Nile Virus in the U.S.: In a matter of a few years West Nile Virus spread across the entire U.S. Maps show cases of West Nile Virus documented by the Centers for Disease Control and Prevention.

Credit: Data from Centers for Disease Control and Prevention. http://www.cdc.gov/ncidod/dvbid/westnile/index.htm