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Weekly Update: West Nile Virus Activity ---United States, September 19--25, 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 September 25, 2001.

During the week of September 19--25, eight human cases of WNV encephalitis were reported in Maryland (five) and New York (three); no deaths were reported. During the same period, WNV infections were reported in 430 crows, 76 other birds, and nine horses. A total of 57 WNV-positive mosquito pools were reported in five states (Connecticut, Illinois, Massachusetts, New Jersey, and Pennsylvania).

During 2001, 20 human cases of WNV encephalitis have been reported in New York (six), Maryland (five), Florida (four), Connecticut (three), Georgia (one), and New Jersey (one); one death occurred in Georgia. A total of 2521 crows and 952 other birds with WNV infection were reported from 23 states and the District of Columbia (Figure 1); 89 WNV infections in other animals (all horses) were reported from 10 states (Alabama, Connecticut, Florida, Georgia, Kentucky, Louisiana, Massachusetts, New York, Pennsylvania, and Virginia); and 568 WNV-positive mosquito pools were reported from 12 states (Connecticut, Florida, Georgia, Illinois, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, and Rhode Island).

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

Figure 1

Figure 1
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