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

West Nile Virus Activity --- United States, October 17--23, 2002

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET and by states and other jurisdictions as of 7 a.m. Mountain Daylight Time, October 23, 2002.

During October 17--23, a total of 244 laboratory-positive human cases of WNV-associated illness were reported from Ohio (n=37), Illinois (n=30), Michigan (n=30), Texas (n=30), the District of Columbia (n=14), Louisiana (n=11), Arkansas (n=10), Missouri (n=10), Kentucky (n=nine), Wisconsin (n=nine), New York (n=eight), Mississippi (n=seven), Minnesota (n=six), Iowa (n=five), Tennessee (n=five), Maryland (n=four), Oklahoma (n=four), Alabama (n=two), Connecticut (n=two), Georgia (n=two), Massachusetts (n=two), New Jersey (n=two), North Dakota (n=two), Delaware (n=one), Florida (n=one), and Virginia (n=one). During this reporting period, Delaware reported its first human cases of WNV infection. During the same period, WNV infections were reported in 285 dead crows and 308 other dead birds. A total of 634 veterinary cases (630 equine and four other species) and 183 WNV-positive mosquito pools were reported.

During 2002, a total of 3,296 human cases with laboratory evidence of recent WNV infection have been reported from Illinois (n=705), Michigan (n=463), Ohio (n=378), Louisiana (n=310), Indiana (n=204), Mississippi (n=178), Missouri (n=159), Texas (n=137), Nebraska (n=114), New York (n=71), Kentucky (n=59), Tennessee (n=49), Pennsylvania (n=47), Iowa (n=44), Alabama (n=41), Minnesota (n=39), South Dakota (n=37), Wisconsin (n=37), the District of Columbia (n=27), Georgia (n=25), Virginia (n=24), Maryland (n=23), Massachusetts (n=21), Arkansas (n=21), North Dakota (n=17), Connecticut (n=14), Florida (n=13), New Jersey (n=10), Oklahoma (n=eight), Kansas (n=six), Colorado (n=five), North Carolina (n=two), West Virginia (n=two), California (n=one), Delaware (n=one), Rhode Island (n=one), South Carolina (n=one), Vermont (n=one), and Wyoming (n=one) (Figure). Among the 2,885 patients for whom data were available, the median age was 56 years (range: 1 month--99 years); 1,545 (54%) were male, and the dates of illness onset ranged from June 10 to October 13. A total of 165 human deaths have been reported. The median age of decedents was 79 years (range: 27--99 years); 99 (60%) deaths were among men. In addition, 6,574 dead crows and 4,919 other dead birds with WNV infection were reported from 42 states and the District of Columbia; 7,061 WNV infections in mammals (7,048 equines, three canines, and 10 other species) have been reported from 35 states (Alabama, Arkansas, Colorado, Delaware, Florida, Georgia, 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, Wisconsin, and Wyoming). During 2002, WNV seroconversions have been reported in 365 sentinel chicken flocks from Florida, Iowa, Nebraska, Pennsylvania, Texas, and New York City; 4,617 WNV-positive mosquito pools have been reported from 26 states (Alabama, Arkansas, Connecticut, Delaware, Georgia, Illinois, Indiana, Iowa, Kentucky, Maryland, Massachusetts, Mississippi, Missouri, Nebraska, New Hampshire, New Jersey, New York, North Carolina, Ohio, 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.

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. #