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West Nile Virus Activity --- United States, January 1--August 15, 2006

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 3 a.m. Mountain Daylight Time, August 15, 2006. A total of 26 states had reported 388 cases of human WNV illness to CDC (Figure, Table). A total of 214 (56%) cases for which such data were available occurred in males; median age of patients was 49 years (range: 2--91 years). Dates of illness onset ranged from January 6 to August 10; a total of 13 cases were fatal. A total of 68 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET during 2006. Of these, 20 were reported from Nebraska; 18 were reported from Texas; five were reported from California; four were reported from Utah; three each were reported from Oklahoma and South Dakota; two each were reported from Idaho, Iowa, Kentucky, and Mississippi; and one each was reported from Arizona, Colorado, Minnesota, Nevada, North Dakota, Wisconsin, and Wyoming. Of the 68 PVDs, 10 persons (median age: 43 years [range: 18--59 years]) subsequently had West Nile fever.

In addition, 1,033 dead corvids and 199 other dead birds with WNV infection have been reported in 30 states and New York City during 2006. WNV infections have been reported in horses in 18 states and one squirrel in Kansas. WNV seroconversions have been reported in 237 sentinel chicken flocks in eight states (Arizona, Arkansas, California, Florida, Iowa, North Carolina, North Dakota, and Utah). Five seropositive sentinel horses were reported in Montana. A total of 3,456 WNV-positive mosquito pools have been reported from 30 states.

Additional information about national WNV activity is available from CDC at and at


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