FIGURE 56.12 West Nile virus in the United States. Following the first appearance of West Nile virus in the United States in 1999, the number of human infections and deaths rapidly increased. Efforts to control populations of mosquitoes that carry the virus are helping to reduce the prevalence of the disease.
(Data from http://www.cdc.gov/ncidod/dvbid/westnile/surv&control.htm)