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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.

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>. Because WNV season is ending, this is the last week of publication of the weekly updates on WNV activity. A full report on WNV surveillance will be published in MMWR at a later date.


Figure 1

Figure 1
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