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West Nile Virus Activity --- United States, October 31--November 6, 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 6, 2002.

During October 31--November 6, a total of 88 laboratory-positive human cases of WNV-associated illness were reported from Ohio (n=28), Michigan (n=11), Kentucky (n=eight), Oklahoma (n=eight), Texas (n=eight), Georgia (n=five), Louisiana (n=four), Iowa (n=three), Missouri (n=three), Florida (n=two), Wisconsin (n=two), Tennessee (n=two), Maryland (n=one), Massachusetts (n=one), Minnesota (n=one), and New York (n=one). During the same period, WNV infections were reported in 219 dead crows and 93 other dead birds. A total of 810 veterinary cases and 45 WNV-positive mosquito pools were reported.

During 2002, a total of 3,507 human cases with laboratory evidence of recent WNV infection have been reported from Illinois (n=719), Michigan (n=483), Ohio (n=413), Louisiana (n=321), Indiana (n=247), Mississippi (n=182), Missouri (n=165), Texas (n=148), Nebraska (n=115), New York (n=74), Kentucky (n=67), Pennsylvania (n=59), Tennessee (n=52), Iowa (n=48), Minnesota (n=42), Alabama (n=41), Wisconsin (n=39), South Dakota (n=37), Georgia (n=30), the District of Columbia (n=27), Maryland (n=25), Virginia (n=24), Massachusetts (n=22), Arkansas (n=21), Florida (n=18), Connecticut (n=17), North Dakota (n=17), Oklahoma (n=16), New Jersey (n=11), Colorado (n=10), 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 3,148 patients for whom data were available, the median age was 56 years (range: 1 month--99 years); 1,676 (54%) were male, and the dates of illness onset ranged from June 10 to October 19. A total of 187 human deaths have been reported. The median age of decedents was 78 years (range: 24--99 years); 111 (59%) deaths were among men. In addition, 7,312 dead crows and 5,436 other dead birds with WNV infection were reported from 42 states and the District of Columbia; 8,143 WNV infections in mammals (8,130 equines, three canines, and 10 other species) have been reported from 36 states (Alabama, Arkansas, Colorado, 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; 4,827 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 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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