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West Nile Virus Update --- United States, January 1--August 14, 2007

This report summarizes 2007 West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 3 a.m. Mountain Daylight Time, August 14, 2007. A total of 27 states have reported 444 cases of human WNV illness to CDC (Figure, Table). A total of 241 (54%) cases for which such data were available occurred in males; median age of patients was 48 years (range: 2--96 years). Dates of illness onset ranged from March 25 to August 5; 15 cases were fatal.

A total of 49 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET during 2007. Of these, 19 were reported from California; seven from Texas; five each from Colorado and North Dakota; three each from Kentucky and South Dakota; two from Minnesota; and one each from Arizona, Iowa, New Mexico, North Carolina, and South Carolina. Of the 49 PVDs, 15 persons (median age: 49 years [range: 18--79 years]) subsequently had West Nile fever.

In addition, 539 dead corvids and 165 other dead birds with WNV infection have been reported in 24 states during 2007. WNV infections have been reported in horses in 17 states, in seven squirrels in California, and in two unidentified animal species in Idaho and Montana. WNV seroconversions have been reported in 189 sentinel chicken flocks in six states (Arizona, California, Florida, Iowa, North Dakota, and Utah) and Puerto Rico. A total of 1,845 WNV-positive mosquito pools have been reported from 31 states. Additional information about national WNV activity is available from CDC at http://www.cdc.gov/ncidod/dvbid/westnile/index.htm and at http://westnilemaps.usgs.gov.


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