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West Nile Virus Activity --- United States, January 1--October 10, 2006
This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 3
a.m. Mountain Daylight Time, October 10, 2006. A total of
41 states and the District of Columbia had reported 3,135 cases
of human WNV illness to CDC (Table, Figure). A total of 1,717 (55%) cases for which such data were available
occurred in males; median age of patients was 50 years (range:
3 months--99 years). Dates of illness onset ranged from January 6
to September 25; a total of 97 cases were fatal.
A total of 260 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET during 2006.
Of these, 40 were reported from Nebraska; 27 from Texas; 24 from Utah; 21 from Colorado; 15 from California; 14
from Louisiana; 11 each from North Dakota and South Dakota; 10 each from Iowa and Wisconsin; nine each from
Arizona, Mississippi, and Oklahoma; eight from Kansas; six from Idaho; five each from Minnesota and Virginia; four each
from Kentucky and Missouri; three each from Illinois, Montana, and Nevada; two from Michigan; and one each from
Arkansas, Maryland, New York, Ohio, Oregon, Pennsylvania, and
Wyoming. Of the 260 PVDs, three persons (median age: 73
years [range: 26--74 years]) subsequently had neuroinvasive illness, one person aged 41 years had other illness, and 54
persons (median age: 46 years [range: 17--70 years]) had West Nile fever.
In addition, 2,746 dead corvids and 636 other dead birds with WNV infection have been reported in 41 states and
New York City during 2006. WNV infections have been reported in horses in 34 states, in one squirrel in Kansas, and in
two unidentified animal species in North Carolina and Wyoming. WNV seroconversions have been reported in 682
sentinel chicken flocks in 12 states (Arizona, Arkansas, California, Florida, Iowa, Montana, Nevada, North Carolina, North
Dakota, Pennsylvania, Utah, and Virginia). A total of 10,157 WNV-positive mosquito pools have been reported from 38 states,
the District of Columbia, and New York City.
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