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Weekly Update: West Nile Virus Activity --- United States, July 17--23, 2002

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET and verified by states and other jurisdictions as of July 23, 2002.

During the reporting week of July 17--23, nine human cases of WNV were reported from two states (Louisiana and Mississippi). During the same period, WNV infections were reported in 202 dead crows, 48 other dead birds, 13 horses, and 69 mosquito pools.

During 2002, a total of 12 human cases of WNV encephalitis or meningitis have been reported from Louisiana and Mississippi. Among these cases, eight were men, the median age was 74 years (range: 34--88 years), and the dates of illness onset ranged from June 10 to July 11. In addition, 373 dead crows and 314 other dead birds with WNV infection were reported from 25 states, New York City, and the District of Columbia (Figure); 36 WNV infections in horses have been reported from six states (Florida, Kentucky, Louisiana, Mississippi, North Dakota, and Texas). During 2002, WNV seroconversions have been reported in six sentinel chicken flocks from Florida; WNV seropositivity has been reported from two states (Indiana and Louisiana) in three wild birds that were caught and released; and 95 WNV-positive mosquito pools have been reported from eight states (Alabama, Illinois, Indiana, Massachusetts, New Jersey, Ohio, Pennsylvania, and Texas) and New York City.

Additional information about WNV activity is available at and


Figure 1
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