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West Nile Virus Activity --- United States, October 3--9, 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 Daylight Time, October 9, 2002.

During the reporting period of October 3--9, a total of 266 laboratory-positive human cases of WNV-associated illness were reported from Michigan (n=58), Illinois (n=55), Ohio (n=25), Pennsylvania (n=11), Alabama (n=nine), New York (n=nine), South Dakota (n=nine), Tennessee (n=nine), Texas (n=nine), Wisconsin (n=nine), Iowa (n=eight), Massachusetts (n=seven), Missouri (n=seven), Louisiana (n=six), Minnesota (n=five), Mississippi (n=five), Connecticut (n=four), Kentucky (n=four), Maryland (n=four), Virginia (n=four), Colorado (n=two), Florida (n=two), West Virginia (n=two), New Jersey (n=one), North Carolina (n=one), and Rhode Island (n=one). During this period, West Virginia and Rhode Island reported their first human WNV cases ever. Also during this time period, WNV infections were reported in 438 dead crows and 298 other dead birds. A total of 915 veterinary cases (all equine) were reported. During the same period, 136 WNV-positive mosquito pools were reported.

During 2002, a total of 2,796 human cases with laboratory evidence of recent WNV infection have been reported from Illinois (n=654), Michigan (n=401), Ohio (n=313), Louisiana (n=293), Mississippi (n=168), Indiana (n=157), Missouri (n=138), Texas (n=101), Nebraska (n=80), New York (n=60), Kentucky (n=44), Tennessee (n=40), Alabama (n=39), Pennsylvania (n=37), Iowa (n=33), South Dakota (n=33), Minnesota (n=31), Wisconsin (n=28), Virginia (n=20), Georgia (n=19), Massachusetts (n=17), North Dakota (n=15), Maryland (n=14), Arkansas (n=11), Connecticut (n=11), Florida (n=10), New Jersey (n=seven), the District of Columbia (n=six), Colorado (n=five), Oklahoma (n=four), North Carolina (n=two), West Virginia (n=two), California (n=one), Rhode Island (n=one), and South Carolina (n=one) (Figure). Among the 2,496 patients for whom data were available, the median age was 56 years (range: 1 month--99 years); 1,348 (54%) were male, and the dates of illness onset ranged from June 10 to September 26. A total of 138 human deaths have been reported. The median age of decedents was 79 years (range: 27--99 years); 82 (59%) deaths were among men. In addition, 6,071 dead crows and 4,514 other dead birds with WNV infection were reported from 43 states and the District of Columbia; 5,292 WNV infections in mammals (5,284 equines, three canines, and five 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 342 sentinel chicken flocks from Florida, Iowa, Nebraska, Pennsylvania, and New York City; 4,010 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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Figure 1
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