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Weekly Update: West Nile Virus Activity --- United States, October 24--30, 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 30, 2001.

During the week of October 24--30, no human cases of WNV encephalitis or meningitis were reported. During the same period, WNV infections were reported in 200 crows, 43 other birds, and eight horses. A total of 11 WNV-positive mosquito pools were reported in five states (Georgia, Kentucky, New Jersey, Ohio, and Virginia).

During 2001, a total of 37 human cases of WNV encephalitis or meningitis have been reported in Florida (ten), Maryland (six), New Jersey (six), New York (six), Connecticut (five), Pennsylvania (three), and Georgia (one); one death occurred in Georgia. Among these 37 cases, 20 (54%) were in men; 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 3,996 crows and 1,437 other birds with WNV infection were reported from 25 states and the District of Columbia (Figure 1); 159 WNV infections in other animals (all horses) were reported from 13 states (Alabama, Connecticut, Florida, Georgia, Kentucky, Louisiana, Massachusetts, Mississippi, New York, North Carolina, Pennsylvania, Tennessee, and Virginia); and 736 WNV-positive mosquito pools were reported from 15 states (Connecticut, Florida, Georgia, Illinois, Kentucky, Maryland, Massachusetts, Michigan, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, and Virginia).

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

Figure 1

Figure 1
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