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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).

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

Figure 1

Figure 1
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