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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).
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