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West Nile Virus Activity --- United States, September 29--October 5, 2004
During September 29--October 5, a total of 81 cases of human West Nile virus (WNV) illness were reported from 18
states (Alabama, Arizona, Arkansas, California, Florida, Georgia, Illinois, Iowa, Kansas, Kentucky, Minnesota, Missouri, Ohio, Oklahoma, Pennsylvania, South Dakota, Texas, and Virginia).
During 2004, a total of 40 states have reported 1,865 cases of human WNV illness to CDC through ArboNET (Table
and Figure). Of these, 583 (31%) cases were reported in California, 370 (20%) in Arizona, and 225 (12%) in Colorado. A total of 1,071 (58%) of the 1,833 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 23; a total of 59 cases were fatal.
A total of 177 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET in 2004. Of these,
70 (40%) were reported in California; 37 (21%) in Arizona; 15 in Texas; 12 in New Mexico; five each in Colorado, Louisiana, and Nevada; four each in Georgia and Oklahoma; 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 177 PVDs, three persons aged 35, 69, and 77 years subsequently had neuroinvasive illness, and
36 persons (median age: 53 years; range: 17--73 years)
subsequently had West Nile fever.
In addition, during 2004, a total of 4,706 dead corvids and 1,138 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 964 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 6,585 WNV-positive mosquito pools have been reported in 36 states, District of Columbia, and New York City.
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