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West Nile Virus Activity --- United States, October 17--23, 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 Daylight Time, October 23, 2002.

During October 17--23, a total of 244 laboratory-positive human cases of WNV-associated illness were reported from Ohio (n=37), Illinois (n=30), Michigan (n=30), Texas (n=30), the District of Columbia (n=14), Louisiana (n=11), Arkansas (n=10), Missouri (n=10), Kentucky (n=nine), Wisconsin (n=nine), New York (n=eight), Mississippi (n=seven), Minnesota (n=six), Iowa (n=five), Tennessee (n=five), Maryland (n=four), Oklahoma (n=four), Alabama (n=two), Connecticut (n=two), Georgia (n=two), Massachusetts (n=two), New Jersey (n=two), North Dakota (n=two), Delaware (n=one), Florida (n=one), and Virginia (n=one). During this reporting period, Delaware reported its first human cases of WNV infection. During the same period, WNV infections were reported in 285 dead crows and 308 other dead birds. A total of 634 veterinary cases (630 equine and four other species) and 183 WNV-positive mosquito pools were reported.

During 2002, a total of 3,296 human cases with laboratory evidence of recent WNV infection have been reported from Illinois (n=705), Michigan (n=463), Ohio (n=378), Louisiana (n=310), Indiana (n=204), Mississippi (n=178), Missouri (n=159), Texas (n=137), Nebraska (n=114), New York (n=71), Kentucky (n=59), Tennessee (n=49), Pennsylvania (n=47), Iowa (n=44), Alabama (n=41), Minnesota (n=39), South Dakota (n=37), Wisconsin (n=37), the District of Columbia (n=27), Georgia (n=25), Virginia (n=24), Maryland (n=23), Massachusetts (n=21), Arkansas (n=21), North Dakota (n=17), Connecticut (n=14), Florida (n=13), New Jersey (n=10), Oklahoma (n=eight), Kansas (n=six), Colorado (n=five), North Carolina (n=two), West Virginia (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 2,885 patients for whom data were available, the median age was 56 years (range: 1 month--99 years); 1,545 (54%) were male, and the dates of illness onset ranged from June 10 to October 13. A total of 165 human deaths have been reported. The median age of decedents was 79 years (range: 27--99 years); 99 (60%) deaths were among men. In addition, 6,574 dead crows and 4,919 other dead birds with WNV infection were reported from 42 states and the District of Columbia; 7,061 WNV infections in mammals (7,048 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; 4,617 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 http://www.cdc.gov/ncidod/dvbid/westnile/index.htm and http://www.cindi.usgs.gov/hazard/event/west_nile/west_nile.html.


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