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Weekly Update: West Nile Virus Activity ---United States, September 26--October 2, 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 October 2, 2001.

During the week of September 26--October 2, five human cases of WNV encephalitis were reported in Connecticut (two) and New Jersey (three); no deaths were reported. During the same period, WNV infections were reported in 539 crows, 239 other birds, and 19 horses. A total of 52 WNV-positive mosquito pools were reported in four states (Connecticut, Massachusetts, New Jersey, and Ohio).

During 2001, 25 human cases of WNV encephalitis have been reported in New York (six), Connecticut (five), Maryland (five), Florida (four), New Jersey (four), and Georgia (one); one death occurred in Georgia. A total of 3,060 crows and 1,191 other birds with WNV infection were reported from 23 states and the District of Columbia (Figure 1); 108 WNV infections in other animals (all horses) were reported from 11 states (Alabama, Connecticut, Florida, Georgia, Kentucky, Louisiana, Massachusetts, Mississippi, New York, Pennsylvania, and Virginia); and 620 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 <http://www.cdc.gov/ncidod/dvbid/westnile/index.htm> and <http://cindi.usgs.gov/hazard/event/west_nile/west_nile.html>.


Figure 1

Figure 1
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