West Nile virus activity--United States, June 23-29, 2004.

As of June 29, eight states had reported a total of 57 human cases of West Nile virus (WNV) illness to CDC through ArboNET in 2004. A total of 38 cases had been reported from Arizona, 10 from California, three from New Mexico, two from Florida, and one each from Michigan, Nebraska, South Dakota, and Wyoming. Thirty-six (64%) of the cases occurred in males; the median age of patients was 53 years (range: 9-84 years), and dates of illness onset ranged from April 23 to June 15. Of the 57 cases, one fatal case was reported from Arizona.