This report summarizes 2007 West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 3 a.m. Mountain Daylight Time, September 11, 2007. A total of 38 states have reported 1,395 cases of human WNV illness to CDC (Figure, Table). A total of 770 (56%) cases for which such data were available occurred in males; median age of patients was 49 years (range: 15 months-96 years). Dates of illness onset ranged from January 8 to September 7; a total of 38 cases were fatal.
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A total of 136 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET during 2007. Of these, 33 were reported from California; 20 from Texas; 13 from Oklahoma; 11 from South Dakota; nine from Minnesota; seven each from Missouri and North Dakota; five from Colorado; four from Kentucky and Mississippi; three each from Iowa, Nebraska, New Mexico, Puerto Rico, and Utah; and one each from Arizona, Louisiana, Montana, North Carolina, Pennsylvania, South Carolina, Virginia, and Wyoming. Of the 136 PVDs, two persons (median age: 66 years; range: 60-71 years) subsequently had neuroinvasive illness, and 31 persons (median age: 49 years; range: 18-79 years) subsequently had West Nile fever.
In addition, 951 dead corvids and 292 other dead birds with WNV infection have been reported in 29 states and New York City during 2007. WNV infections have been reported in horses in 26 states, one canine in Oregon, 11 squirrels in California, and three unidentified animal species in Idaho and Montana. WNV seroconversions have been reported in 316 sentinel chicken flocks in nine states (Arizona, Arkansas, California, Delaware, Florida, Iowa, North Dakota, Oregon, and Utah) and Puerto Rico. A total of 5,172 WNV-positive mosquito pools have been reported from 35 states and New York City.
Additional information about national WNV activity is available from CDC at http://www.cdc.gov/ncidod/dvbid/ westnile/index.htm and at http://westnilemaps.usgs.gov.
TABLE. Number of human cases of West Nile virus (WNV) illness, by
state--United States, 2007 *
West Other
Neuroinvasive Nile clinical/
disease fever unspecified
State ([dagger]) ([section]) ([paragraph])
Alabama 12 1 0
Arizona 10 4 2
Arkansas 5 1 0
California 73 113 12
Colorado 10 62 0
Connecticut 3 1 0
Florida 3 0 0
Georgia 8 6 2
Idaho 1 69 0
Illinois 14 4 1
Iowa 5 7 0
Kansas 9 12 0
Kentucky 1 0 0
Louisiana 1 1 0
Maryland 0 0 1
Massachusetts 0 1 0
Michigan 1 0 0
Minnesota 29 41 0
Mississippi 17 27 0
Missouri 14 4 0
Montana 28 72 0
Nebraska 8 62 0
Nevada 1 2 0
New Mexico 17 8 0
New York 1 0 0
North Dakota 23 161 0
Ohio 1 2 0
Oklahoma 24 15 1
Oregon 3 8 0
Pennsylvania 1 0 0
South Carolina 0 2 0
South Dakota 37 123 0
Tennessee 2 1 0
Texas 34 9 0
Utah 6 6 0
Virginia 2 0 0
Wisconsin 2 2 0
Wyoming 10 123 10
Total 416 950 29
Total
reported
State to CDC ** Deaths
Alabama 13 3
Arizona 16 0
Arkansas 6 1
California 198 10
Colorado 72 1
Connecticut 4 0
Florida 3 1
Georgia 16 0
Idaho 70 0
Illinois 19 1
Iowa 12 0
Kansas 21 0
Kentucky 1 0
Louisiana 2 0
Maryland 1 0
Massachusetts 1 0
Michigan 1 0
Minnesota 70 0
Mississippi 44 1
Missouri 18 0
Montana 100 3
Nebraska 70 3
Nevada 3 0
New Mexico 25 1
New York 1 0
North Dakota 184 2
Ohio 3 0
Oklahoma 40 4
Oregon 11 0
Pennsylvania 1 0
South Carolina 2 0
South Dakota 160 4
Tennessee 3 0
Texas 43 2
Utah 12 0
Virginia 2 0
Wisconsin 4 0
Wyoming 143 1
Total 1,395 38
* As of September 11, 2007.
([dagger]) Cases with neurologic manifestations (i.e., West Nile
meningitis, West Nile encephalitis, and West Nile myelitis).
([section]) Cases with no evidence of neuroinvasion.
([paragraph]) Illnesses for which sufficient clinical information was
not provided.
** Total number of human cases of WNV illness reported to ArboNET by
state and local health departments.
COPYRIGHT 2007 U.S. Government Printing Office
COPYRIGHT 2008 Gale, Cengage Learning
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