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West Nile Virus Activity --- United States, August 28--September 3, 2003

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

During the reporting week of August 28--September 3, a total of 414 human cases of WNV infection were reported from 22 states (Alabama, Georgia, Iowa, Kansas, Kentucky, Louisiana, Minnesota, Mississippi, Missouri, Montana, Nebraska, New Jersey, New Mexico, New York, Ohio, Oklahoma, Pennsylvania, South Dakota, Tennessee, Texas, Virginia, and Wyoming), including 16 fatal cases from eight states (Iowa, Missouri, Nebraska, New Mexico, New York, South Dakota, Texas, and Wyoming). During the same period, WNV infections were reported in 975 dead birds, 252 horses, one dog, one squirrel, two unidentified animal species, and 532 mosquito pools.

During 2003, a total of 1,856 human cases of WNV infection have been reported from Colorado (n = 635), Nebraska (n = 280), South Dakota (n = 250), Wyoming (n = 164), Texas (n = 146), New Mexico (n = 57), Louisiana (n = 42), Pennsylvania (n = 38), Montana (n = 32), Mississippi (n = 30), North Dakota (n = 28), Alabama (n = 20), Oklahoma (n = 18), Kansas (n = 17), Minnesota (n = 17), Iowa (n = 15), Ohio (n = 14), Missouri (n = six), New York (n = six), Arkansas (n = five), Georgia (n = five), Tennessee (n = five), Florida (n = four), Kentucky (n = four), Virginia (four), New Jersey (n = three), Illinois (n = two), Maryland (n = two), North Carolina (n = two), Arizona (n = one), Connecticut (n = one), Massachusetts (n = one), South Carolina (n = one), and Wisconsin (n = one) (Figure). Of 1,172 (63%) cases for which demographic data were available, 660 (56%) occurred among males; the median age was 49 years (range: 3 months--97 years), and the dates of illness onset ranged from March 28 to August 27. Of the 1,172 cases, 37 fatal cases were reported from Nebraska (n = eight), Colorado (n = six), New Mexico (n = four), Wyoming (n = four), South Dakota (n = three), Texas (n = three), Alabama (n = two), Iowa (n = two), Kansas (n = one), Mississippi (n = one), Missouri (n = one), New York (n = one), and Ohio (n = one). A total of 157 presumptive WNV viremic blood donors have been reported from Nebraska (n = 73), South Dakota (n = 41), Texas (n = 20), New Mexico (n = seven), Oklahoma (n = four), Iowa (n = three), Mississippi (n = three), Minnesota (n = two), Montana (n = two), Florida (n = one), and Louisiana (n = one). Of these donors, 12 subsequently had WNV fever, and none subsequently had WNV meningoencephalitis. In addition, 5,197 dead birds with WNV infection were reported from 40 states and New York City; 1,162 WNV infections in horses have been reported from 33 states, five WNV infections were reported in dogs, two infections in squirrels, and 12 infections in unidentified animal species. During 2003, WNV seroconversions have been reported in 546 sentinel chicken flocks from 12 states. Louisiana and South Dakota each reported three seropositive sentinel horses. A total of 3,174 WNV-positive mosquito pools have been reported from 32 states and New York City.

Additional information about WNV activity is available from CDC at and


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