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West Nile Virus Activity --- United States, January 1--October 10, 2006

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 3 a.m. Mountain Daylight Time, October 10, 2006. A total of 41 states and the District of Columbia had reported 3,135 cases of human WNV illness to CDC (Table, Figure). A total of 1,717 (55%) cases for which such data were available occurred in males; median age of patients was 50 years (range: 3 months--99 years). Dates of illness onset ranged from January 6 to September 25; a total of 97 cases were fatal.

A total of 260 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET during 2006. Of these, 40 were reported from Nebraska; 27 from Texas; 24 from Utah; 21 from Colorado; 15 from California; 14 from Louisiana; 11 each from North Dakota and South Dakota; 10 each from Iowa and Wisconsin; nine each from Arizona, Mississippi, and Oklahoma; eight from Kansas; six from Idaho; five each from Minnesota and Virginia; four each from Kentucky and Missouri; three each from Illinois, Montana, and Nevada; two from Michigan; and one each from Arkansas, Maryland, New York, Ohio, Oregon, Pennsylvania, and Wyoming. Of the 260 PVDs, three persons (median age: 73 years [range: 26--74 years]) subsequently had neuroinvasive illness, one person aged 41 years had other illness, and 54 persons (median age: 46 years [range: 17--70 years]) had West Nile fever.

In addition, 2,746 dead corvids and 636 other dead birds with WNV infection have been reported in 41 states and New York City during 2006. WNV infections have been reported in horses in 34 states, in one squirrel in Kansas, and in two unidentified animal species in North Carolina and Wyoming. WNV seroconversions have been reported in 682 sentinel chicken flocks in 12 states (Arizona, Arkansas, California, Florida, Iowa, Montana, Nevada, North Carolina, North Dakota, Pennsylvania, Utah, and Virginia). A total of 10,157 WNV-positive mosquito pools have been reported from 38 states, the District of Columbia, and New York City.

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


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