Case Counts by County

CountyHuman Cases
Alameda-
Alpine-
Amador-
Butte-
Calaveras-
Colusa-
Contra Costa-
Del Norte-
El Dorado-
Fresno-
Glenn-
Humboldt-
Imperial-
Inyo-
Kern-
Kings-
Lake-
Lassen-
Los Angeles-
Madera-
Marin-
Mariposa-
Mendocino-
Merced-
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange-
Placer-
Plumas-
Riverside-
Sacramento-
San Benito-
San Bernardino-
San Diego-
San Francisco-
San Joaquin-
San Luis Obispo-
San Mateo-
Santa Barbara-
Santa Clara-
Santa Cruz-
Shasta-
Sierra-
Siskiyou-
Solano-
Sonoma-
Stanislaus-
Sutter-
Tehama-
Trinity-
Tulare-
Tuolumne-
Ventura-
Yolo-
Yuba-
Total0

WNV Activity by County
Printable Version
2008 | 2007

Human data is updated every Tuesday and Friday by 4pm. Dead Bird and Squirrel data are updated every Wednesday by 4pm. Horse, Mosquito and Sentinel Chicken data are updated every Friday by 4pm.
- View Printable Map -

Total Counties with
WNV in 2008: 8

New counties highlighted in red.
Kern, Los Angeles, Orange, Riverside, Sacramento, San Diego, Santa Clara, and Sutter.

Latest WNV News
2008 California Mosquito-borne Virus Surveillance and Response Plan 04/21/08
The West Nile virus surveillance and response plan has been updated for 2008 and now includes separate analyses for urban and rural virus transmission risk. Download the latest plan here.
- view news and press release archives -

human cases

YTD: 0 Counties: 0
No human cases have tested positive for WNV in 2008.
 

horses

YTD: 0 Counties: 0
No horses have tested positive for WNV in 2008.
 

dead birds

YTD: 13 Counties: 7
There have been 2 new WNV positive dead birds reported in California this week from Los Angeles (1) and Sutter (1) counties. This is the first indication of WNV from Sutter County this year. 13 dead birds from 7 counties have tested positive for WNV in 2008.
 

mosquito samples

YTD: 9 Counties: 1
9 mosquito samples from 1 county have tested positive for WNV in 2008.
 

sentinel chickens

YTD: 2 Counties: 1
2 sentinel chickens from 1 county have tested positive for WNV in 2008.
 

squirrels

YTD: 0 Counties: 0
No squirrels have tested positive for WNV in 2008.

National Activity
Arizona, Mississippi, and Tennessee have each reported their first human case this year. None of the cases have resulted in fatalities. In addition, California and Alabama have reported non-human WNV activity.

Be a West Nile Watcher

Help us track down the West Nile Virus by reporting all dead birds and squirrels. Call 1-877-968-2473 to report a dead bird or squirrel or you can submit an online report.

2003-2007 WNV Activity Summary

Element 2003 2004 2005 2006 2007 Total
Human Cases (fatal) 31 (0) 779 (29) 880 (19) 278 (7) 380 (21) 2,320 (75)
Click here for a printable version of the 2004-2007 WNV Human Case Summary
Element 2003 2004 2005 2006 2007 Total
Horses 12 540 456 58 28 1,083
Dead Birds 96 3,232 3,046 1,446 1,395 9,215
Mosquito Samples 32 1,136 1,242 832 1,007 4,249
Sentinel Chickens 70 809 1,053 640 510 3,082
Squirrels - 49 48 32 26 155
1 There were 20 imported human cases. 2 There were 3 imported horse cases.

Locate Your Local Mosquito and Vector Control Agency
Search by Zip Code

Compared to 2007 YTD

As of 05/07/08 20072008
Counties98
Human Cases10
Horses10
Dead Birds2213
Mosquito Samples29
Sentinel Chickens22
Squirrels00
2007 YTD - Year to date corresponds to the same time last year.

- view all 2007 activity -

WNV Reports

Weekly Report

05.07 2008 YTD WNV Activity Map
05.072008 WNV Activity by County
05.02 Arbovirus Bulletin #11

Humans

04.22 2004-2007 WNV Case Summary
04.21 2007 Human WNV Case Linelist
03.07 2007 Summary Table of Human Infection

Dead Birds

05.07Reported, Tested, Positive 2008
05.07Positive Species
05.07Positive Counts by City/County

Mosquitoes

05.02 AMOR - GRAVID Week 17
05.02 AMOR - EVS Week 17
05.02 AMOR - NJLT Week 17

Sentinel Chickens

05.02 Submission Data for 4/28/08 - 5/2/08
04.25 Submission Data for 4/21/08 - 4/25/08
04.18 Submission Data for 4/14/08 - 4/18/08

Horses

11.02 Confirmed Equine Cases
10.04 2007 Equine WNV Result Map
- view report archives -