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West Nile Virus Activity --- United States, November 7--13, 2002

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET and by states and other jurisdictions as of 8 a.m. Mountain Standard Time, November 13, 2002.

During November 7--13, a total of 80 laboratory-positive human cases of WNV-associated illness were reported from Michigan (n=21), Illinois (n=19), the District of Columbia (n=seven), Alabama (n=five), Missouri (n=four), New York (n=four), Kansas (n=three), Maryland (n=three), Virginia (n=three), Wisconsin (n=three), Colorado (n=two), Louisiana (n=two), Tennessee (n=two), Montana (n=one), and New Jersey (n=one). During this period, Montana reported its first-ever human case of WNV infection. Also, during the same period, WNV infections were reported in 210 dead crows and 294 other dead birds. A total of 169 veterinary cases and 79 WNV-positive mosquito pools were reported.

During 2002, a total of 3,587 human cases with laboratory evidence of recent WNV infection have been reported from Illinois (n=738), Michigan (n=504), Ohio (n=413), Louisiana (n=323), Indiana (n=247), Mississippi (n=182), Missouri (n=169), Texas (n=148), Nebraska (n=115), New York (n=78), Kentucky (n=67), Pennsylvania (n=59), Tennessee (n=54), Iowa (n=48), Alabama (n=46), Minnesota (n=42), Wisconsin (n=42), South Dakota (n=37), the District of Columbia (n=34), Georgia (n=30), Maryland (n=28), Virginia (n=27), Massachusetts (n=22), Arkansas (n=21), Florida (n=18), Connecticut (n=17), North Dakota (n=17), Oklahoma (n=16), Colorado (n=12), New Jersey (n=12), Kansas (n=nine), West Virginia (n=three), North Carolina (n=two), California (n=one), Delaware (n=one), Montana (n=one), Rhode Island (n=one), South Carolina (n=one), Vermont (n=one), and Wyoming (n=one) (Figure). Among the 3,226 patients for whom data were available, the median age was 56 years (range: 1.5 months--99 years); 1,719 (54%) were male, and the dates of illness onset ranged from June 10 to October 21. A total of 196 human deaths have been reported. The median age of decedents was 78 years (range: 24--99 years); 119 (61%) deaths were among men. In addition, 7,522 dead crows and 5,730 other dead birds with WNV infection were reported from 42 states and the District of Columbia; 8,312 WNV infections in mammals (8,299 equines, three canines, and 10 other species) have been reported from 37 states (Alabama, Arkansas, Colorado, Connecticut, Delaware, Florida, Georgia, Idaho, 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 366 sentinel chicken flocks from Florida, Iowa, Nebraska, North Carolina, Pennsylvania, Texas, and New York City; 4,906 WNV-positive mosquito pools have been reported from 27 states (Alabama, Arkansas, Connecticut, Delaware, Georgia, Illinois, Indiana, Iowa, Kansas, 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 at and


Figure 1
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