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West Nile Virus Activity --- United States, October 27--November 2, 2004

During October 27--November 2, a total of 10 cases of human West Nile virus (WNV) illness were reported from eight states (Arizona, Georgia, Iowa, Michigan, New Mexico, Ohio, Oklahoma, and Pennsylvania).

During 2004, 40 states and the District of Columbia (DC) have reported 2,241 cases of human WNV illness to CDC through ArboNET (Figure and Table). Of these, 710 (32%) cases were reported in California, 381 (17%) in Arizona, and 276 (12%) in Colorado. A total of 1,295 (59%) of the 2,211 cases for which such data were available occurred in males; the median age of patients was 52 years (range: 1 month--99 years). Date of illness onset ranged from April 23 to October 21; a total of 76 cases were fatal.

A total of 199 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET in 2004. Of these, 73 (37%) were reported in California; 38 (19%) in Arizona; 16 in Texas; 15 in New Mexico; seven in Colorado; six each in Louisiana and Oklahoma; five in Nevada; four in Georgia and Iowa; three each in Florida, Michigan, and South Dakota; two each in Minnesota, Mississippi, Missouri, and Wisconsin; and one each in Delaware, Kentucky, Nebraska, New Jersey, New York, North Dakota, Oregon, and Pennsylvania. Of the 199 PVDs, three persons aged 35, 69, and 77 years subsequently had neuroinvasive illness, and 46 persons (median age: 52 years; range: 17--73 years) subsequently had West Nile fever.

In addition, 5,441 dead corvids and 1,328 other dead birds with WNV infection have been reported from 45 states and New York City during 2004. WNV infections have been reported in horses in 37 states; one bat in Wisconsin; nine dogs in Nevada, New Mexico, and Wisconsin; six squirrels in Arizona and Wyoming; and 14 unidentified animal species in nine states (Arizona, Idaho, Illinois, Iowa, Kentucky, Missouri, Nevada, New York, and South Carolina). WNV seroconversions have been reported in 1,345 sentinel chicken flocks in 13 states (Alabama, Arizona, Arkansas, California, Delaware, Florida, Iowa, Louisiana, Nebraska, Nevada, Pennsylvania, South Dakota, and Utah) and in 25 wild hatchling birds in Missouri and Ohio. Four seropositive sentinel horses were reported in Minnesota and Puerto Rico. A total of 7,558 WNV-positive mosquito pools have been reported in 38 states, DC, and New York City.

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.

Figure

Figure 2
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Table

Table 3
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