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West Nile Virus Activity --- United States, October 24--30, 2002

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET and by states and other jurisdictions as of 7 a.m. Mountain Standard Time, October 30, 2002.

During October 24--30, a total of 123 laboratory-positive human cases of WNV-associated illness were reported from Indiana (n=43), Illinois (n=14), Pennsylvania (n=12), Michigan (n=nine), Louisiana (n=seven), Ohio (n=seven), Colorado (n=five), Mississippi (n=four), Connecticut (n=three), Florida (n=three), Missouri (n=three), Texas (n=three), Minnesota (n=two), New York (n=two), Iowa (n=one), Maryland (n=one), Nebraska (n=one), New Jersey (n=one), Tennessee (n=one), and West Virginia (n=one). During the same period, WNV infections were reported in 519 dead crows and 424 other dead birds. A total of 272 veterinary cases and 165 WNV-positive mosquito pools were reported.

During 2002, a total of 3,419 human cases with laboratory evidence of recent WNV infection have been reported from Illinois (n=719), Michigan (n=472), Ohio (n=385), Louisiana (n=317), Indiana (n=247), Mississippi (n=182), Missouri (n=162), Texas (n=140), Nebraska (n=115), New York (n=73), Pennsylvania (n=59), Kentucky (n=59), Tennessee (n=50), Iowa (n=45), Alabama (n=41), Minnesota (n=41), South Dakota (n=37), Wisconsin (n=37), the District of Columbia (n=27), Georgia (n=25), Maryland (n=24), Virginia (n=24), Arkansas (n=21), Massachusetts (n=21), Connecticut (n=17), North Dakota (n=17), Florida (n=16), New Jersey (n=11), Colorado (n=10), Oklahoma (n=eight), Kansas (n=six), West Virginia (n=three), North Carolina (n=two), California (n=one), Delaware (n=one), Rhode Island (n=one), South Carolina (n=one), Vermont (n=one), and Wyoming (n=one) (Figure). Among the 3,044 patients for whom data were available, the median age was 56 years (range: 1 month--99 years); 1,643 (54%) were male, and the dates of illness onset ranged from June 10 to October 19. A total of 180 human deaths have been reported. The median age of decedents was 79 years (range: 24--99 years); 107 (59%) deaths were among men. In addition, 7,093 dead crows and 5,343 other dead birds with WNV infection were reported from 42 states and the District of Columbia; 7,333 WNV infections in mammals (7,320 equines, three canines, and 10 other species) have been reported from 35 states (Alabama, Arkansas, Colorado, Delaware, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Massachusetts, Minnesota, Mississippi, Missouri, Montana, Nebraska, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Vermont, Virginia, Wisconsin, and Wyoming). During 2002, WNV seroconversions have been reported in 365 sentinel chicken flocks from Florida, Iowa, Nebraska, Pennsylvania, Texas, and New York City; 4,782 WNV-positive mosquito pools have been reported from 26 states (Alabama, Arkansas, Connecticut, Delaware, Georgia, Illinois, Indiana, Iowa, Kentucky, Maryland, Massachusetts, Mississippi, Missouri, Nebraska, New Hampshire, New Jersey, New York, North Carolina, Ohio, Pennsylvania, Rhode Island, South Carolina, South Dakota, Texas, Vermont, and Virginia), New York City, and the District of Columbia.

Additional information about WNV activity is available from CDC at and


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