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West Nile Virus Activity --- United States, June 30--July 6, 2004

During June 30--July 6, a total of 21 human cases of West Nile virus (WNV) illness were reported from two states (Arizona and California). During 2004, eight states have reported a total of 78 human cases of WNV illness to CDC through ArboNET (Table, Figure). Of these, 57 (73%) were reported from Arizona. Forty-seven (61%) of the 78 cases occurred in males; the median age of patients was 53 years (range: 1--84 years); the dates of illness onset ranged from April 23 to June 28; and one case was fatal.

A total of 20 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET. Of these, 19 were reported from Arizona, and one was reported from New Mexico. Of the 20 PVDs reported to ArboNET, one person aged 69 years subsequently had neuroinvasive illness, and four persons aged 22, 51, 52, and 57 years subsequently had West Nile fever. In New Mexico, the first reported human WNV infection in 2004 was in a PVD; in Arizona, three of the first seven reported human WNV infections of 2004 were in PVDs.

In addition, during 2004, a total of 861 dead corvids and 86 other dead birds with WNV infection have been reported from 24 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 110 sentinel chicken flocks from four states (Arizona, California, Florida, and Louisiana). Three seropositive sentinel horses were reported from Puerto Rico. A total of 226 WNV-positive mosquito pools have been reported from 12 states (Arizona, California, Illinois, Indiana, Louisiana, Michigan, Missouri, New Jersey, Ohio, Pennsylvania, Texas, and Virginia).

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.

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