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West Nile Virus Activity --- United States, August 29 -- September 4, 2002

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET and by states and other jurisdictions as of 7:00 a.m. Mountain Daylight Time, September 4, 2002.

During the reporting period of August 29--September 4, a total of 257 laboratory-positive human cases of WNV-associated illness were reported from Illinois (n=94), Louisiana (n=34), Ohio (n=16), Tennessee (n=15), Michigan (n=14), Mississippi (n=13), Missouri (n=12), New York (n=eight), Kentucky (n=seven), Alabama (n=five), Texas (n=five), Indiana (n=four), North Dakota (n=four), South Dakota (n=four), Wisconsin (n=four), Arkansas (n= three), Minnesota (n= three), Nebraska (n=three), Virginia (n=two), Connecticut (n=one), Florida (n=one), Iowa (n=one), Maryland (n=one), Massachusetts (n=one), Pennsylvania (n=one), and South Carolina (n=one). During this period, Arkansas, Connecticut, Iowa, Minnesota, North Dakota, Pennsylvania, and South Carolina reported their first human cases for 2002. During the same period, WNV infections were reported in 653 dead crows, 360 other dead birds, 322 horses, and 456 mosquito pools.

During 2002, a total of 737 human cases with laboratory evidence of recent WNV infection have been reported from Louisiana (n=205), Illinois (n=165), Mississippi (n=104), Texas (n=43), Ohio (n=40), Missouri (n=37), Michigan (n=29), Tennessee (n=19), Alabama (n=13), New York (n=13), Indiana (n=10), Kentucky (n=10), South Dakota (n=seven), Georgia (n=six), Wisconsin (n=six), Nebraska (n=four), North Dakota (n=four), Arkansas (n=three), Minnesota (n=three), Virginia (n=three), Florida (n=two), Maryland (n=two), Massachusetts (n=two), Oklahoma (n=two), Connecticut (n=one), the District of Columbia (n=one), Iowa (n=one), Pennsylvania (n=one), and South Carolina (n=one) (Figure). Among the patients with available data, the median age was 52 years (range: 9 months--98 years); 341 (57%) were male, and the dates of illness onset ranged from June 10 to August 28. A total of 35 human deaths have been reported. The median age of decedents was 76 years (range: 48--94 years); 20 (57%) deaths were among men. In addition, 3,243 dead crows and 2,232 other dead birds with WNV infection were reported from 39 states, New York City, and the District of Columbia; 1,159 WNV infections in mammals (all but one in horses) have been reported from 27 states (Alabama, Arkansas, Colorado, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Minnesota, Mississippi, Montana, Nebraska, New Mexico, New York, North Dakota, Ohio, Oklahoma, Pennsylvania, South Dakota, Tennessee, Texas, Vermont, Virginia, and Wyoming). During 2002, WNV seroconversions have been reported in 99 sentinel chicken flocks from Florida, Nebraska, Pennsylvania, and New York City; 1,947 WNV-positive mosquito pools have been reported from 18 states (Alabama, Connecticut, Georgia, Illinois, Indiana, Kentucky, Maryland, Massachusetts, Mississippi, Nebraska, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, South Dakota, Texas, 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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