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West Nile Virus Update --- United States, January 1--July 22, 2008
This report summarizes 2008 West Nile virus (WNV) surveillance data reported to CDC through ArboNET as
of 3 a.m. Mountain Daylight Time, July 22, 2008. A total of 14 states have reported 43 cases of human WNV illness to
CDC (Figure, Table). A total of 26 (54%) cases for which such data were available occurred in males; median age of patients was
46 years (range: 12--80 years). Dates of illness onset ranged from January 17 to July 10; none of the cases were fatal.
A total of eight presumptive West Nile viremic blood
donors (PVDs) have been reported to ArboNET during 2008.
Of these, four were reported from California, three from Louisiana, and one from Kentucky. Of the eight PVDs,
one person (aged 47 years) subsequently had West Nile fever.
In addition, 368 dead corvids and 79 other dead birds with WNV infection have been reported in eight states during
2008. WNV infections have been reported in horses in eight states and Puerto Rico, in one squirrel in California, and in
one unidentified animal species in Puerto Rico. WNV seroconversions have been reported in 38 sentinel chicken flocks in
three states (Arizona, California, and Florida) and Puerto Rico. A total of 975 WNV-positive mosquito pools have
been reported from 19 states and New York City.
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