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

Update: West Nile Virus Activity --- United States, 2005

This report summarizes West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 3 a.m. Mountain Standard Time, November 8, 2005. A total of 42 states have reported 2,653 cases of human WNV illness in 2005 (Figure and Table 1). By comparison, a total of 2,282 WNV cases had been reported as of November 8, 2004 (Table 2). A total of 1,405 (56%) of the 2,490 cases for which such data were available in 2005 occurred in males; the median age of patients was 51 years (range: 3 months--98 years). Dates of illness onset ranged from January 2 to October 21; a total of 86 cases were fatal.

A total of 381 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET during 2005. Of these, 88 were reported from California; 57 from Texas; 53 from Nebraska; 22 from Louisiana; 20 from Arizona; 19 from Kansas; 18 from Iowa; 17 from South Dakota; 13 from Oklahoma; 11 from Minnesota; 10 from Illinois; five each from Michigan, New Mexico, and North Dakota; four each from Alabama, Pennsylvania, and Utah; three each from Nevada and Wisconsin; two each from Colorado, Indiana, Maryland, Mississippi, Montana, and Ohio; and one each from Florida, Idaho, Kentucky, Missouri, New York, North Carolina, Oregon, and South Carolina. Of the 381 PVDs, three persons aged 53, 56, and 72 years subsequently had neuroinvasive illness; seven persons (median age: 41 years [range: 17--64 years]) subsequently had other illnesses; and 84 persons (median age: 46 years [range: 17--78 years]) subsequently had West Nile fever.

In addition, 4,227 dead corvids and 902 other dead birds with WNV infection have been reported from 45 states. WNV infections have been reported in horses in 34 states; five dogs in Idaho, Minnesota, and Nebraska; six squirrels in Arizona; and five unidentified animal species in four states (Arizona, Illinois, North Carolina, and Texas). WNV seroconversions have been reported in 1,534 sentinel chicken flocks from 16 states. Eight seropositive sentinel birds have been reported in Michigan. One seropositive sentinel horse was reported in Minnesota. A total of 11,095 WNV-positive mosquito pools have been reported from 43 states and the District of Columbia.

Additional information about national WNV activity is available from CDC at http://www.cdc.gov/ncidod/dvbid/westnile/index.htm and at http://westnilemaps.usgs.gov.


Figure

Figure
Return to top.
Table 1

Table 1
Return to top.
Table 2

Table 2
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 (http://www.cdc.gov/mmwr) 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 mmwrq@cdc.gov.

 
USA.gov: 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. #