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West Nile Virus Activity --- United States, September 4--10, 2003

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 3 a.m., Mountain Daylight Time, September 10, 2003.

During the reporting week of September 4--10, a total of 1,067 human cases of WNV infection were reported from 24 states (Colorado, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Louisiana, Maryland, Minnesota, Mississippi, Montana, Nebraska, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, South Dakota, Tennessee, Texas, Wisconsin, and Wyoming), including 17 fatal cases from seven states (Colorado, Georgia, Montana, Nebraska, New York, South Dakota, and Texas). During the same period, WNV infections were reported in 948 dead birds, 395 horses, five dogs, one squirrel, and 600 mosquito pools.

During 2003, a total of 2,923 human cases of WNV infection have been reported from Colorado (n = 973), Nebraska (n = 436), South Dakota (n = 407), Wyoming (n = 239), Texas (n = 190), Montana (n = 116), New Mexico (n = 95), North Dakota (n = 91), Louisiana (n = 48), Mississippi (n = 43), Pennsylvania (n = 38), Minnesota (n = 31), Oklahoma (n = 25), Iowa (n = 23), Florida (n = 22), Alabama (n = 20), Ohio (n = 19), Kansas (n = 18), New York (n = 13), North Carolina (n = 10), Illinois (n = eight), Maryland (n = eight), Georgia (n = seven), Indiana (n = six), Missouri (n = six), Tennessee (n = six), Arkansas (n = five), Wisconsin (n = five), Kentucky (n = four), Virginia (four), New Jersey (n = three), Arizona (n = one), Connecticut (n = one), Massachusetts (n = one), and South Carolina (n = one) (Figure). Of 2,800 (96%) cases for which demographic data were available, 1,471 (53%) occurred among males; the median age was 47 years (range: 1 month--99 years), and the dates of illness onset ranged from March 28 to August 29. Of the 2,800 cases, 54 fatal cases were reported from Colorado (n = 13), Nebraska (n = 10), Texas (n = six), South Dakota (n = five), New Mexico (n = four), Wyoming (n = four), Alabama (n = two), Iowa (n = two), New York (n = two), Georgia (n = one), Kansas (n = one), Mississippi (n = one), Missouri (n = one), Montana (n = one), and Ohio (n = one). A total of 240 presumptive West Nile (WN)--viremic blood donors have been reported from Nebraska (n = 116), South Dakota (n = 48), Texas (n = 20), Wyoming (n=16), New Mexico (n = 11), Oklahoma (n = 11), Montana (n = five), Iowa (n = three), Minnesota (n = three), Mississippi (n = three), Florida (n = one), Louisiana (n = one), New Jersey (n = one), and Tennessee (n = one). Of these 240 donors, 20 subsequently had onset of WN fever, and one subsequently had onset of WN meningoencephalitis. In addition, 6,145 dead birds with WNV infection were reported from 40 states and New York City; 1,557 WNV infections in horses have been reported from 34 states, 10 WNV infections were reported in dogs, three infections in squirrels, and 12 infections in unidentified animal species. During 2003, WNV seroconversions have been reported in 552 sentinel chicken flocks from 12 states, and 17 seropositive sentinel horses have been reported from five states. A total of 3,774 WNV-positive mosquito pools have been reported from 36 states and New York City.

Additional information about WNV activity is available from CDC at and


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