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West Nile Virus Activity --- United States, 2005

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 3 a.m., Mountain Daylight Time, July 12, 2005.

Eleven states have reported 25 cases of human WNV illness (Figure and Table) in 2005. Nineteen (79%) of the 24 cases for which such data were available occurred in males; the median age of patients was 45 years (range: 17--80 years). Date of illness onset ranged from May 14 to June 30; one case was fatal.

Seven presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET in 2005. Of these, five were reported in Texas, and two in Arizona.

In addition, 281 dead corvids and 96 other dead birds with WNV infection have been reported from 16 states during 2005. WNV infections have been reported in horses in 11 states. WNV seroconversions have been reported in 40 sentinel chicken flocks in five states (Arizona, Arkansas, California, Florida, and Minnesota). A total of 439 WNV-positive mosquito pools have been reported in 13 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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