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Weekly Update: West Nile Virus Activity ---United States, November 7--13, 2001

The following report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET and verified by states and other jurisdictions as of November 13, 2001.

During the week of November 7--13, three human cases of WNV encephalitis or meningitis were reported from New York (two) and Louisiana (one). During the same period, WNV infections were reported in 266 crows, 15 other birds, and six horses. A total of 17 WNV-positive mosquito pools were reported from two jurisdictions (Pennsylvania and District of Columbia).

During 2001, a total of 45 human cases of WNV encephalitis or meningitis has been reported from New York (12), Florida (10), Connecticut (six), Maryland (six), New Jersey (six), Pennsylvania (three), Georgia (one), and Louisiana (one). Among these 45 cases, 24 (53%) were in men; the median age was 70 years (range: 36--90 years); dates of illness onset ranged from July 13 to October 7; three persons died. A total of 4,517 crows and 1,474 other birds with WNV infection was reported from 26 states and the District of Columbia (Figure 1); 176 WNV infections in other animals (all horses) were reported from 14 states (Alabama, Connecticut, Florida, Georgia, Indiana, Kentucky, Louisiana, Massachusetts, Mississippi, New York, North Carolina, Pennsylvania, Tennessee, and Virginia). During 2001, 753 WNV-positive mosquito pools were reported from 15 states (Connecticut, Florida, Georgia, Illinois, Kentucky, Maryland, Massachusetts, Michigan, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, and Virginia) and the District of Columbia.

Additional information about WNV activity is available at <> and <>.

Figure 1

Figure 1
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