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West Nile Virus Activity --- United States, January 1--July 18, 2006

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 3 a.m. Mountain Daylight Time, July 18, 2006. A total of 10 states had reported 15 cases of human WNV illness to CDC (Figure, Table). Nine (60%) cases for which such data were available occurred in males; median age of patients was 50 years (range: 9--89 years). Date of illness onset ranged from January 6 to July 8; no deaths were reported.

A total of 11 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET during 2006. Of these, two each were reported from Colorado, Kentucky, and Nebraska and one each from Idaho, Iowa, Oklahoma, South Dakota, and Texas.

In addition, 367 dead corvids and 51 other dead birds with WNV infection have been reported from 22 states during 2006. WNV infections have been reported in horses from seven states. WNV seroconversions have been reported in 33 sentinel chicken flocks from six states (Arkansas, California, Florida, Iowa, North Carolina, and North Dakota). A total of 525 WNV-positive mosquito pools have been reported from 23 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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