Skip directly to search Skip directly to A to Z list Skip directly to site content
CDC Home

West Nile Virus Activity --- United States, August 15--21, 2002

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET and by states and other jurisdictions as of 7:30 a.m. Mountain Daylight Time, August 21, 2002.

During the reporting period of August 15--21, a total of 114 laboratory-positive human cases of WNV-associated illness were reported from Louisiana (n=62), Illinois (n=fourteen), Texas (n=11), Missouri (n=nine), Mississippi (n=seven), Indiana (n=three), Alabama (n=two), Ohio (two), Tennessee (two), Kentucky (n=one), and New York City (n=one). During this period, Kentucky, Missouri, Ohio, Tennessee, and New York City reported their first human cases. During the same period, WNV infections were reported in 458 dead crows, 430 other dead birds, 117 horses, and 318 mosquito pools. During this period, WNV activity was reported for the first time ever in Colorado and Wyoming.

During 2002, a total of 270 human cases with laboratory evidence of recent WNV infection have been reported from Louisiana (n=147), Mississippi (n=55), Texas (n=25), Illinois (n=16), Missouri (n=nine), Alabama (n=five), Indiana (n=four), Ohio (n=two), Tennessee (n=two), the District of Columbia (n=one), Florida (n=one), Kentucky (n=one), Massachusetts (n=one), and New York City (n=one). Thirteen deaths have been reported from Louisiana (n=eight), Mississippi (n=two), Illinois (n=one), Kentucky (n=one), and Texas (n=one) (Figure). Among the patients with available data, the median age was 53 years (range: 3--94 years), and the dates of illness onset ranged from June 10 to August 14. In addition, 1,916 dead crows and 1,567 other dead birds with WNV infection were reported from 38 states, New York City, and the District of Columbia; 256 WNV infections in mammals (all but one in horses) have been reported from 19 states (Alabama, Colorado, Florida, Georgia, Illinois, Kansas, Kentucky, Louisiana, Minnesota, Mississippi, Nebraska, New York, North Dakota, Ohio, Oklahoma, South Dakota, Tennessee, Texas, and Wyoming). During 2002, WNV seroconversions have been reported in 65 sentinel chicken flocks from Florida, Nebraska, Pennsylvania, and New York City; 1,105 WNV-positive mosquito pools have been reported from 15 states (Alabama, Georgia, Illinois, Indiana, Kentucky, Massachusetts, Mississippi, Nebraska, New Jersey, New York, Ohio, Pennsylvania, South Dakota, Texas, and Virginia), New York City, and the District of Columbia.

Additional information about WNV activity is available at and


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.

All MMWR HTML versions of articles are electronic conversions from typeset documents. This conversion might result in character translation or format errors in the HTML version. Users are referred to the electronic PDF version ( and/or the original MMWR paper copy for printable versions of 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 The U.S. Government's Official Web PortalDepartment of Health and Human Services
Centers for Disease Control and Prevention   1600 Clifton Road Atlanta, GA 30329-4027, USA
800-CDC-INFO (800-232-4636) TTY: (888) 232-6348 - Contact CDC–INFO
A-Z Index
  1. A
  2. B
  3. C
  4. D
  5. E
  6. F
  7. G
  8. H
  9. I
  10. J
  11. K
  12. L
  13. M
  14. N
  15. O
  16. P
  17. Q
  18. R
  19. S
  20. T
  21. U
  22. V
  23. W
  24. X
  25. Y
  26. Z
  27. #