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West Nile Virus Activity --- United States, June 9--15, 2004

As of June 15, a total of 14 human cases of West Nile virus (WNV) illness had been reported to CDC through ArboNET from five states. Ten cases were reported from Arizona, and one case each from California, New Mexico, South Dakota, and Wyoming (Figure). Ten (71%) of the cases occurred in males; the median age of patients was 53 years (range: 9--69 years), and dates of illness onset ranged from May 8 to June 1.

A total of 12 presumptive West Nile viremic blood donors have been reported to ArboNET. Of these, 11 were reported from Arizona and one was reported from New Mexico. Of the 12 donors reported to ArboNET, one person aged 69 years subsequently had neuroinvasive disease, and two persons aged 22 and 52 years had West Nile fever.

In addition, during 2004, a total of 471 dead corvids and 55 other dead birds with WNV infection have been reported from 18 states, and 16 WNV infections in horses have been reported from six states (Alabama, Arizona, Missouri, Oklahoma, Texas, and Virginia). WNV seroconversions have been reported in 64 sentinel chicken flocks from four states (Arizona, California, Florida, and Louisiana), and 88 WNV-positive mosquito pools have been reported from eight states (Arizona, California, Illinois, Indiana, Louisiana, Missouri, Pennsylvania, and Texas).

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


Figure 1
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