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Weekly Update: West Nile Virus Activity ---United States, October
31--November 6, 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
6, 2001.
During the week of October 31--November 6, five human cases of
WNV encephalitis or meningitis were reported in New York (four) and Connecticut
(one). During the same period, WNV infections were reported in 255 crows, 22 other
birds, and 11 horses. No WNV-positive mosquito pools were reported.
During 2001, a total of 42 human cases of WNV encephalitis or meningitis
have been reported in Florida (10), New York (10), Connecticut (six), Maryland (six),
New Jersey (six), Pennsylvania (three), and Georgia (one). Among the 42 cases, 22
(52%) were in males; the median age was 70.5 years (range: 36--90 years); dates of
illness onset ranged from July 13 to October 7; and two persons died. A total of 4,251
crows and 1,459 other birds with WNV infection were reported from 26 states and the
District of Columbia (Figure 1); 170 WNV infections in other animals (all horses) were
reported from 14 states (Alabama, Connecticut, Florida, Georgia, Indiana, 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).
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