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Weekly Update: West Nile Virus Activity --- United States, October 17--23, 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 23, 2001.

During the week of October 17--23, six human cases of WNV encephalitis or meningitis were reported in Pennsylvania (three), New Jersey (two), and Florida (one). During the same period, WNV infections were reported in 101 crows, 45 other birds, and 26 horses. A total of 31 WNV-positive mosquito pools were reported in five states (Connecticut, Florida, Georgia, New York, and Ohio).

During 2001, 37 human cases of WNV encephalitis or meningitis have been reported in Florida (10), Maryland (six), New York (six), New Jersey (six), Connecticut (five), Pennsylvania (three), and Georgia (one); one death occurred in Georgia. Among these 37 cases, 20 (54%) were in males, the median age was 69 years (range: 36--81 years), and dates of illness onset ranged from July 13 to October 7. A total of 3,796 crows and 1,394 other birds with WNV infection were reported from 25 states and the District of Columbia (Figure 1); 151 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 725 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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