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.

West Nile Virus Activity --- United States, November 21--26, 2002

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET and by states and other jurisdictions as of 9:30 a.m. Mountain Standard Time, November 26, 2002.

During November 21--26, a total of 39 laboratory-positive human cases of WNV-associated illness were reported from Michigan (n=19), Illinois (n=15), Wisconsin (n=three), Florida (n=one), Maryland (n=one), Minnesota (n=one), and New York (n=one). During the same period, WNV infections were reported in 103 dead crows and 215 other dead birds. A total of 328 veterinary cases and 12 WNV-positive mosquito pools were reported.

During 2002, a total of 3,737 human cases with laboratory evidence of recent WNV infection have been reported from Illinois (n=776), Michigan (n=523), Ohio (n=419), Louisiana (n=323), Indiana (n=284), Mississippi (n=182), Missouri (n=169), Texas (n=165), Nebraska (n=124), New York (n=79), Kentucky (n=67), Pennsylvania (n=59), Tennessee (n=55), Iowa (n=48), Alabama (n=46), Minnesota (n=46), Wisconsin (n=45), South Dakota (n=37), Georgia (n=35), the District of Columbia (n=34), Maryland (n=30), Virginia (n=27), Arkansas (n=25), Florida (n=23), Massachusetts (n=23), Connecticut (n=17), North Dakota (n=17), Oklahoma (n=16), Colorado (n=12), New Jersey (n=12), Kansas (n=nine), North Carolina (n=two), California (n=one), Delaware (n=one), Montana (n=one), Rhode Island (n=one), South Carolina (n=one), Vermont (n=one), West Virginia (n=one), and Wyoming (n=one) (Figure). Among the 3,378 patients for whom data were available, the median age was 55 years (range: 1.5 months--99 years); 1,802 (54%) were male, and the dates of illness onset ranged from June 10 to November 4. A total of 201 human deaths have been reported. The median age of decedents was 78 years (range: 24--99 years); 121 (60%) deaths were among men. In addition, 7,715 dead crows and 6,275 other dead birds with WNV infection were reported from 42 states and the District of Columbia; 9,051 WNV infections in mammals (9,038 equines, three canines, and 10 other species) have been reported from 38 states (Alabama, Arkansas, Colorado, Connecticut, Delaware, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Massachusetts, Minnesota, Mississippi, Missouri, Montana, Nebraska, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Vermont, Virginia, Washington, Wisconsin, and Wyoming). During 2002, WNV seroconversions have been reported in 366 sentinel chicken flocks from Florida, Iowa, Nebraska, North Carolina, Pennsylvania, Texas, and New York City; 4,943 WNV-positive mosquito pools have been reported from 28 states (Alabama, Arkansas, Connecticut, Delaware, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Maryland, Massachusetts, Mississippi, Missouri, Nebraska, New Hampshire, New Jersey, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, Rhode Island, South Carolina, South Dakota, Texas, Vermont, and Virginia), New York City, and the District of Columbia.

Additional information about WNV activity is available from CDC at and


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. URL addresses listed in MMWR were current as of the date of publication.

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: 11/27/2002


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 11/27/2002