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Weekly Update: West Nile Virus Activity --- United States, October 10--16, 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 16, 2001.

During the week of October 10--16, six human cases of WNV encephalitis were reported in Florida (five) and Maryland (one). During the same period, WNV infections were reported in 312 crows, 50 other birds, and 12 horses. A total of 23 WNV-positive mosquito pools were reported in four states (Maryland, Massachusetts, New Jersey, and Pennsylvania).

During 2001, 31 human cases of WNV encephalitis have been reported in Florida (nine), Maryland (six), New York (six), Connecticut (five), New Jersey (four), and Georgia (one); one death occurred in Georgia. Among these 31 cases, 16 (52%) were in males, the median age was 70 years (range: 37--81 years), and dates of illness onset ranged from July 14 to September 30. A total of 3,695 crows and 1,349 other birds with WNV infection were reported from 25 states and the District of Columbia (Figure 1); 125 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 694 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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