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West Nile Virus Activity --- United States, July 7--13, 2004

During the week of July 7--13, a total of 30 human West Nile virus illness cases were reported from four states (Arizona, California, Colorado, and Iowa). During 2004, a total of 10 states have reported a total of 108 cases of human West Nile virus (WNV) illness to CDC through ArboNET (Table, Figure). Of these, 66 (61%) were reported from Arizona. Sixty-one (58%) of the 108 cases occurred in males; median age of patients was 52 years (range: 1--84 years); dates of illness onset ranged from April 23 to July 5; and three cases were fatal.

A total of 18 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET. Of these, 17 were reported from Arizona, and one was reported from New Mexico. Of the 18 PVDs reported to ArboNET, two persons aged 66 and 69 years subsequently had neuroinvasive illness, and four persons aged 22, 51, 52, and 57 years subsequently had West Nile fever.

In addition, during 2004, a total of 1,080 dead corvids and 108 other dead birds with WNV infection have been reported from 29 states, and 42 WNV infections in horses have been reported from 11 states (Alabama, Arizona, California, Idaho, Missouri, North Carolina, Oklahoma, South Dakota, Tennessee, Texas, and Virginia). WNV seroconversions have been reported in 167 sentinel chicken flocks from four states (Arizona, California, Florida, and Louisiana). Three seropositive sentinel horses were reported from Puerto Rico. A total of 362 WNV-positive mosquito pools have been reported from 14 states (Arizona, California, Georgia, Illinois, Indiana, Louisiana, Michigan, Missouri, New Jersey, Ohio, Pennsylvania, Tennessee, Texas, and Virginia).

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


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