Skip Navigation LinksSkip Navigation Links
Centers for Disease Control and Prevention
Safer Healthier People
Blue White
Blue White
bottom curve
CDC Home Search Health Topics A-Z spacer spacer
Blue curve MMWR spacer

Persons using assistive technology might not be able to fully access information in this file. For assistance, please send e-mail to: Type 508 Accommodation and the title of the report in the subject line of e-mail.

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).

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

Figure 1

Figure 1
Return to top.

Use of trade names and commercial sources is for identification only and does not imply endorsement by the U.S. Department of Health and Human Services.

References to non-CDC sites on the Internet are provided as a service to MMWR readers and do not constitute or imply endorsement of these organizations or their programs by CDC or the U.S. Department of Health and Human Services. CDC is not responsible for the content of pages found at these sites.

Disclaimer   All MMWR HTML versions of articles are electronic conversions from ASCII text into HTML. This conversion may have resulted in character translation or format errors in the HTML version. Users should not rely on this HTML document, but are referred to the electronic PDF version and/or the original MMWR paper copy for the official text, figures, and tables. An original paper copy of this issue can be obtained from the Superintendent of Documents, U.S. Government Printing Office (GPO), Washington, DC 20402-9371; telephone: (202) 512-1800. Contact GPO for current prices.

**Questions or messages regarding errors in formatting should be addressed to

Page converted: 11/13/2001


Safer, Healthier People

Morbidity and Mortality Weekly Report
Centers for Disease Control and Prevention
1600 Clifton Rd, MailStop E-90, Atlanta, GA 30333, U.S.A


Department of Health
and Human Services

This page last reviewed 11/13/2001