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West Nile Virus Activity --- United States, August 15--21, 2002

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET and by states and other jurisdictions as of 7:30 a.m. Mountain Daylight Time, August 21, 2002.

During the reporting period of August 15--21, a total of 114 laboratory-positive human cases of WNV-associated illness were reported from Louisiana (n=62), Illinois (n=fourteen), Texas (n=11), Missouri (n=nine), Mississippi (n=seven), Indiana (n=three), Alabama (n=two), Ohio (two), Tennessee (two), Kentucky (n=one), and New York City (n=one). During this period, Kentucky, Missouri, Ohio, Tennessee, and New York City reported their first human cases. During the same period, WNV infections were reported in 458 dead crows, 430 other dead birds, 117 horses, and 318 mosquito pools. During this period, WNV activity was reported for the first time ever in Colorado and Wyoming.

During 2002, a total of 270 human cases with laboratory evidence of recent WNV infection have been reported from Louisiana (n=147), Mississippi (n=55), Texas (n=25), Illinois (n=16), Missouri (n=nine), Alabama (n=five), Indiana (n=four), Ohio (n=two), Tennessee (n=two), the District of Columbia (n=one), Florida (n=one), Kentucky (n=one), Massachusetts (n=one), and New York City (n=one). Thirteen deaths have been reported from Louisiana (n=eight), Mississippi (n=two), Illinois (n=one), Kentucky (n=one), and Texas (n=one) (Figure). Among the patients with available data, the median age was 53 years (range: 3--94 years), and the dates of illness onset ranged from June 10 to August 14. In addition, 1,916 dead crows and 1,567 other dead birds with WNV infection were reported from 38 states, New York City, and the District of Columbia; 256 WNV infections in mammals (all but one in horses) have been reported from 19 states (Alabama, Colorado, Florida, Georgia, Illinois, Kansas, Kentucky, Louisiana, Minnesota, Mississippi, Nebraska, New York, North Dakota, Ohio, Oklahoma, South Dakota, Tennessee, Texas, and Wyoming). During 2002, WNV seroconversions have been reported in 65 sentinel chicken flocks from Florida, Nebraska, Pennsylvania, and New York City; 1,105 WNV-positive mosquito pools have been reported from 15 states (Alabama, Georgia, Illinois, Indiana, Kentucky, Massachusetts, Mississippi, Nebraska, 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


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