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West Nile Virus Activity --- United States, January 1--September 12, 2006

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 3 a.m. Mountain Daylight Time, September 12, 2006. A total of 36 states and the District of Columbia had reported 1,634 cases of human WNV illness to CDC (Figure, Table). A total of 921 (57%) cases for which such data were available occurred in males; median age of patients was 51 years (range: 3 months--95 years). Dates of illness onset ranged from January 6 to September 10; a total of 52 cases were fatal.

A total of 159 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET during 2006. Of these, 33 were reported from Nebraska; 25 from Texas; 12 from California; 11 from Utah; nine from Wisconsin; eight each were reported from Idaho and Iowa; seven each from Louisiana and South Dakota; six from North Dakota; five each from Minnesota and Mississippi; four from Missouri; three each from Kansas, Kentucky, and Oklahoma; two each from Colorado and Nevada; and one each from Arizona, Illinois, Montana, New York, Oregon, and Wyoming. Of the 159 PVDs, one person aged 73 years subsequently had neuroinvasive illness, and 36 persons (median age: 46 years [range: 18--67 years]) subsequently had West Nile fever.

In addition, 2,138 dead corvids and 503 other dead birds with WNV infection have been reported in 39 states and New York City during 2006. WNV infections have been reported in horses in 27 states, in one squirrel in Kansas, and in one unidentified animal species in Wyoming. WNV seroconversions have been reported in 495 sentinel chicken flocks in 10 states (Arizona, Arkansas, California, Florida, Iowa, North Carolina, North Dakota, Pennsylvania, Utah, and Virginia). Five seropositive sentinel horses were reported in Montana. A total of 7,492 WNV-positive mosquito pools have been reported from 36 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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