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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, August 9, 2005.

Twenty-two states (Arizona, Arkansas, California, Colorado, Florida, Georgia, Illinois, Indiana, Kansas, Louisiana, Minnesota, Mississippi, Missouri, Nevada, New Mexico, New York, North Carolina, North Dakota, Ohio, Pennsylvania, South Dakota, and Texas) have reported 187 cases of human WNV illness in 2005 (Figure and Table). Ninety-eight (57%) of the 171 cases for which such data were available occurred in males; the median age of patients was 47 years (range: 4--85 years). Date of illness onset ranged from May 14 to August 4; three cases were fatal.

Fifty-four presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET during 2005. Of these, 25 were reported from California, 18 from Texas, five from South Dakota, three from Arizona, and one each from Iowa, Louisiana, and Mississippi. Of the 54 PVDs, 11 persons (median age: 50 years [range: 17--77 years]) subsequently had West Nile fever.

In addition, 1,162 dead corvids and 248 other dead birds with WNV infection have been reported from 32 states. WNV infections have been reported in horses from 21 states (Alabama, Arizona, California, Colorado, Idaho, Illinois, Kansas, Kentucky, Minnesota, Mississippi, Missouri, Nebraska, Nevada, New Mexico, North Dakota, Ohio, Oklahoma, South Dakota, Texas, Vermont, and Wyoming), one dog from Nebraska, and one squirrel from Arizona. WNV seroconversions have been reported in 126 sentinel chicken flocks from nine states (Arizona, Arkansas, California, Florida, Iowa, Louisiana, North Dakota, New Mexico, and Utah). One seropositive sentinel horse was reported from Minnesota. A total of 2,493 WNV-positive mosquito pools have been reported from 27 states (Alabama, Arizona, Arkansas, California, Colorado, Connecticut, Georgia, Idaho, Illinois, Indiana, Kansas, Louisiana, Massachusetts, Michigan, Minnesota, Missouri, Nebraska, Nevada, New Jersey, New Mexico, Ohio, Pennsylvania, South Dakota, Tennessee, Texas, Utah, and Virginia).

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


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