U.S. West Nile Virus Activity, Nov. 7-13, 2001

The following report summarizes West Nile virus (WNV) surveillance data reported to the Centers for Disease Control (CDC) through ArboNET and verified by states and other jurisdictions as of Tuesday, Nov. 13, 2001.

During the week of Wednesday, Nov. 7 to Tuesday, Nov. 13, 2001, three human cases of WNV encephalitis or meningitis were reported from New York (2) and Louisiana (1). During the same period, WNV infections were reported in 266
crows, 15 other birds, and 6 horses. A total of 17 WNV-positive mosquito pools was reported from 2 jurisdictions (Pennsylvania and District of Columbia).  

During 2001, a total of 45 human cases of WNV encephalitis or meningitis has been reported from New York (12), Florida (10), Connecticut (6), Maryland (6), New Jersey (6), Pennsylvania (3), Georgia (1), and Louisiana (1). Among these 45 cases, 24 (53%) were in men; the median age was 70 years (range: 36 to 90 years); dates of illness onset ranged from July 13 to Oct 7, 2001; three persons died.

During 2001, totals of 4517 crows and 1474 other birds with WNV infection were reported from 26 states and the District of Columbia.

During 2001, 176 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).

During 2001, 753 WNV-positive mosquito pools have been 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  .

Visit http://www.thehorse.com/wnv for more information.

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