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Weekly Update: West Nile Virus Activity ---United States, September
12--18, 2001
The following report summarizes surveillance data for West Nile virus
(WNV) infection reported to CDC through ArboNET and verified by states and jurisdictions
as of September 18, 2001.
During the week of September 12--18, three human cases of WNV
encephalitis were reported, all in Connecticut; no deaths were reported. During the same
period among animal WNV activity, 474 crows, 173 other birds, and 61 horses were
verified as WNV-positive. Thirty-eight WNV-positive mosquito pools also were reported
in three states (Florida, New Jersey, and Pennsylvania).
A year-to-date total of 12 human cases of WNV encephalitis has been identified
in Connecticut (three), Florida (four), Georgia (one), New Jersey (one), and New
York (three); one death occurred in Georgia. During 2001, a total of 2091 crows and
876 other birds were confirmed WNV-positive in 20 states and the District of
Columbia (Figure 1); 80 WNV infections were confirmed in other animals (all horses) in
nine states (Alabama, Connecticut, Florida, Georgia, Kentucky, Louisiana,
Massachusetts, New York, and Pennsylvania); and 511 WNV-positive mosquito pools were found in
11
states (Connecticut, Florida, Georgia, Massachusetts, Maryland, New Hampshire,
New Jersey, New York, Ohio, Pennsylvania, and Rhode Island).
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