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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 (Figure). 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.
A total of 13 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET. Of these, 12
were reported from Arizona, and one was reported from New Mexico. Of the 13 PVDs reported to ArboNET, one person aged
69 years subsequently had neuroinvasive illness, and three persons aged 22, 51, and 52 years subsequently had West Nile fever.
In New Mexico, the first detected WNV activity in 2004 was in a PVD; in Arizona, three of the first seven reported
human WNV infections in 2004 were in PVDs.
In addition, during 2004, a total of 760 dead corvids and 85 other dead birds with WNV infection have been reported
from 23 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 89 sentinel chicken flocks from four states (Arizona, California, Florida, and Louisiana). Three seropositive sentinel horses were reported from Puerto Rico. A total of 180 WNV-positive mosquito pools have been reported from 11 states
(Arizona, California, Illinois, Indiana, Louisiana, Michigan, Missouri, New Jersey, Pennsylvania, Texas, and Virginia).
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