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Weekly Update: West Nile Virus Activity ---United States, November
14--20, 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 November
20, 2001.
During the week of November 14--20, three human cases of WNV encephalitis
or meningitis were reported from Massachusetts (two) and New Jersey (one).
During the same period, WNV infections were reported in 87 crows, 23 other birds, and
13 horses. A total of three WNV-positive mosquito pools were reported from two
states (Georgia and Ohio).
During 2001, a total of 48 human cases of WNV encephalitis or meningitis
have been reported in New York (12), Florida (10), New Jersey (seven), Connecticut
(six), Maryland (six), Pennsylvania (three), Massachusetts (two), Georgia (one),
and Louisiana (one). Among these 48 cases, 27 (56%) were in males; the median age
was 70 years (range: 36--90 years); dates of illness onset ranged from July 13 to
October 15; and five (10%) patients died. A total of 4,604 crows and 1,497 other birds with
WNV infection were reported from 27 states and the District of Columbia (Figure 1);
189 WNV infections in other animals (all horses) were reported from 15 states
(Alabama, Connecticut, Florida, Georgia, Illinois, Indiana, Kentucky, Louisiana,
Massachusetts, Mississippi, New York, North Carolina, Pennsylvania, Tennessee, and Virginia).
During
2001, 756 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) and the District of Columbia.
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