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 in the subject line of e-mail.

Weekly Update: West Nile Virus Activity --- United States, July 17--23, 2002

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET and verified by states and other jurisdictions as of July 23, 2002.

During the reporting week of July 17--23, nine human cases of WNV were reported from two states (Louisiana and Mississippi). During the same period, WNV infections were reported in 202 dead crows, 48 other dead birds, 13 horses, and 69 mosquito pools.

During 2002, a total of 12 human cases of WNV encephalitis or meningitis have been reported from Louisiana and Mississippi. Among these cases, eight were men, the median age was 74 years (range: 34--88 years), and the dates of illness onset ranged from June 10 to July 11. In addition, 373 dead crows and 314 other dead birds with WNV infection were reported from 25 states, New York City, and the District of Columbia (Figure); 36 WNV infections in horses have been reported from six states (Florida, Kentucky, Louisiana, Mississippi, North Dakota, and Texas). During 2002, WNV seroconversions have been reported in six sentinel chicken flocks from Florida; WNV seropositivity has been reported from two states (Indiana and Louisiana) in three wild birds that were caught and released; and 95 WNV-positive mosquito pools have been reported from eight states (Alabama, Illinois, Indiana, Massachusetts, New Jersey, Ohio, Pennsylvania, and Texas) and New York City.

Additional information about WNV activity is available 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: 7/25/2002


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 7/25/2002