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
spacer
Blue curve MMWR spacer
spacer
spacer

Persons using assistive technology might not be able to fully access information in this file. For assistance, please send e-mail to: mmwrq@cdc.gov. Type 508 Accommodation and the title of the report in the subject line of e-mail.

West Nile Virus Update --- United States, January 1--September 11, 2007

This report summarizes 2007 West Nile virus (WNV) surveillance data reported to CDC through ArboNET as of 3 a.m. Mountain Daylight Time, September 11, 2007. A total of 38 states have reported 1,395 cases of human WNV illness to CDC (Figure, Table). A total of 770 (56%) cases for which such data were available occurred in males; median age of patients was 49 years (range: 15 months--96 years). Dates of illness onset ranged from January 8 to September 7; a total of 38 cases were fatal.

A total of 136 presumptive West Nile viremic blood donors (PVDs) have been reported to ArboNET during 2007. Of these, 33 were reported from California; 20 from Texas; 13 from Oklahoma; 11 from South Dakota; nine from Minnesota; seven each from Missouri and North Dakota; five from Colorado; four from Kentucky and Mississippi; three each from Iowa, Nebraska, New Mexico, Puerto Rico, and Utah; and one each from Arizona, Louisiana, Montana, North Carolina, Pennsylvania, South Carolina, Virginia, and Wyoming. Of the 136 PVDs, two persons (median age: 66 years; range: 60--71 years) subsequently had neuroinvasive illness, and 31 persons (median age: 49 years; range: 18--79 years) subsequently had West Nile fever.

In addition, 951 dead corvids and 292 other dead birds with WNV infection have been reported in 29 states and New York City during 2007. WNV infections have been reported in horses in 26 states, one canine in Oregon, 11 squirrels in California, and three unidentified animal species in Idaho and Montana. WNV seroconversions have been reported in 316 sentinel chicken flocks in nine states (Arizona, Arkansas, California, Delaware, Florida, Iowa, North Dakota, Oregon, and Utah) and Puerto Rico. A total of 5,172 WNV-positive mosquito pools have been reported from 35 states and New York City.

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.

Table

Table
Return to top.
Figure

Figure
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 mmwrq@cdc.gov.

Date last reviewed: 9/12/2007

HOME  |  ABOUT MMWR  |  MMWR SEARCH  |  DOWNLOADS  |  RSSCONTACT
POLICY  |  DISCLAIMER  |  ACCESSIBILITY

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

USA.GovDHHS

Department of Health
and Human Services