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Weekly Update: West Nile Virus Activity ---United States, October 3--9, 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 9, 2001.

During the week of October 3--9, no human cases of WNV encephalitis were reported. During the same period, WNV infections were reported in 323 crows, 108 other birds, and five horses. A total of 51 WNV-positive mosquito pools were reported in five states (Georgia, Kentucky, Michigan, New York, and Pennsylvania).

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. Of these, 13 (52%) cases occurred in females, median age was 71 years (range: 37--81 years), and dates of onset ranged from July 13 to September 11. A total of 3,383 crows and 1,299 other birds with WNV infection were reported from 25 states and the District of Columbia (Figure 1); 113 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 671 WNV-positive mosquito pools were reported from 14 states (Connecticut, Florida, Georgia, Illinois, Kentucky, Maryland, Massachusetts, Michigan, 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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