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West Nile Virus Activity --- United States, October 20--26, 2004
During October 20--26, a total of 80 cases of human West Nile virus (WNV) illness were reported from 16 states
(Arizona, California, Florida, Iowa, Kentucky, Louisiana, Michigan, Mississippi, Missouri, Montana, Nebraska, New York, Ohio, South Dakota, Texas, and Utah).
During 2004, a total of 40 states and the District of
Columbia (DC) have reported 2,231 cases of human WNV illness
to CDC through ArboNET (Figure and Table). Of these, 710 (32%) cases were reported in California, 379 (17%) in
Arizona, and 276 (12%) in Colorado. A total of 1,289 (59%) of the 2,201 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 15; a total of 73 cases were fatal.
A total of 196 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; three each in Florida, Michigan, and South Dakota; two each in Minnesota, Mississippi, Missouri, and Wisconsin; and one each in Delaware, Iowa, Kentucky, Nebraska, New Jersey,
New York, North Dakota, Oregon, and Pennsylvania. Of the 196 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, during 2004, a total of 5,416 dead corvids and 1,316 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; 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).
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