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West Nile Virus Activity --- United States, October 6--12, 2004

During October 6--12, a total of 86 cases of human West Nile virus (WNV) illness were reported from 18 states (Arizona, Florida, Illinois, Kansas, Louisiana, Michigan, Minnesota, Missouri, Nevada, New Jersey, New Mexico, North Dakota, Ohio, Oklahoma, Pennsylvania, Tennessee, Texas, and Utah).

During 2004, a total of 40 states and the District of Columbia (DC) have reported 1,951 cases of human WNV illness to CDC through ArboNET (Figure and Table). Of these, 583 (30%) cases were reported in California, 375 (19%) in Arizona, and 225 (12%) in Colorado. A total of 1,118 (58%) of the 1,919 cases for which such data were available occurred in males; the median age of patients was 51 years (range: 1 month--99 years). Illness onset ranged from April 23 to September 28; a total of 62 cases were fatal.

A total of 184 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET in 2004. Of these, 70 (38%) were reported in California; 37 (20%) in Arizona; 16 in Texas; 15 in New Mexico; seven in Louisiana; five each in Colorado, Nevada, and Oklahoma; four in Georgia; three each in Florida and South Dakota; two each in Minnesota, Missouri, and Wisconsin; and one each in Delaware, Iowa, Michigan, Nebraska, New Jersey, North Dakota, Oregon, and Pennsylvania. Of the 184 PVDs, three persons aged 35, 69, and 77 years subsequently had neuroinvasive illness, and 40 persons (median age: 52 years; range: 17--73 years) subsequently had West Nile fever.

In addition, during 2004, a total of 4,831 dead corvids and 1,183 other dead birds with WNV infection have been reported from 45 states and New York City. WNV infections have been reported in horses in 36 states; one bat in Wisconsin; six dogs in Nevada, New Mexico, and Wisconsin; six squirrels in Arizona and Wyoming; and 13 unidentified animal species in eight states (Arizona, Idaho, Illinois, Iowa, Missouri, Nevada, New York, and South Carolina). WNV seroconversions have been reported in 1,195 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 6,925 WNV-positive mosquito pools have been reported in 37 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.

Table

Table 1
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Figure

Figure 1
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