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West Nile Virus Update --- United States, January 1--August 19, 2008
This report summarizes 2008 West Nile virus (WNV)
surveillance data reported to CDC through ArboNET as
of 3 a.m. Mountain Daylight Time, August 19, 2008. A total of 28 states have reported 236 cases of human WNV illness
to CDC (Figure, Table). A total of 137 (58%) cases for which such data were available
occurred in males; median age of patients was 48 years (range: 10 months--86 years). Dates of illness onset ranged from
January 17 to August 14; two cases were fatal.
A total of 37 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET during 2008. Of
these, 20 were reported from California, four from Texas, three each from Louisiana and Minnesota, two from Mississippi, and
one each from Arizona, Iowa, Kentucky, Nevada, and Wisconsin. Of the 37 PVDs, one person aged 24 years subsequently
had neuroinvasive illness, one person aged 48 years subsequently developed other/unknown illness, and 10 persons (median
age: 43 years [range: 29--55 years]) subsequently had West Nile fever.
In addition, 881 dead corvids and 212 other dead birds with WNV infection have been reported in 17 states during
2008. WNV infections have been reported in horses in 14 states and Puerto Rico, in five squirrels in California, and in
one unidentified animal species in Puerto Rico. WNV seroconversions have been reported in 88 sentinel chicken flocks in
five
states (Arizona, California, Florida, Louisiana, and Utah) and Puerto Rico. A total of 3,083 WNV-positive mosquito
pools have been reported from 33 states, District of Columbia, and New York City.
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