CA Dept. of Public Health UC Davis Arbovirus Research and Training Mosquito and Vector Control Assoc. of CA

Case Counts by County

CountyDead birds
Alameda-
Alpine-
Amador-
Butte-
Calaveras-
Colusa-
Contra Costa-
Del Norte-
El Dorado-
Fresno-
Glenn-
Humboldt-
Imperial-
Inyo-
Kern-
Kings-
Lake-
Lassen-
Los Angeles6
Madera-
Marin-
Mariposa-
Mendocino-
Merced-
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange5
Placer-
Plumas-
Riverside-
Sacramento3
San Benito-
San Bernardino-
San Diego30
San Francisco-
San Joaquin-
San Luis Obispo-
San Mateo-
Santa Barbara-
Santa Clara8
Santa Cruz-
Shasta-
Sierra-
Siskiyou-
Solano1
Sonoma-
Stanislaus-
Sutter-
Tehama-
Trinity-
Tulare-
Tuolumne-
Ventura-
Yolo-
Yuba-
Total53

WNV Activity by County
Printable Version
2016 | 2015 | 2014
2013 | 2012 | 2011
2010 | 2009 | 2008
2007

Data on this website is updated every Friday by 4pm.

Due to different reporting schedules, case totals on this website may not always be consistent with those reported by local health departments.

April 17 - 23 is West Nile and Mosquito and Vector Control Awareness Week in California! This week highlights the importance of preventing mosquito bites and protecting Californians from mosquito-borne diseases. Stop by the "Fight the Bite" event at the State Capitol in Sacramento on Thursday, April 21st from 1:00 - 4:00pm for more information. Contact your local mosquito and vector control district to learn about events in your area.

Interactive Map

View the interactive map courtesy of http://maps.calsurv.org
- View Printable Map -

Total Counties with
WNV in 2016: 11

New counties highlighted in red.
Kern, Los Angeles, Orange, Riverside, Sacramento, San Bernardino, San Diego, San Joaquin, Santa Clara, Solano, and Tulare.

WNV Dead Bird Hotline Update
The West Nile virus and Dead Bird Hotline is staffed with live operators from 8AM to 4:30PM, Monday through Friday (beginning in late May we will also be staffed on Sundays). Call the hotline at 1-877-WNV-BIRD to report a dead bird.
Reporting a Dead Bird Video
- view news and press release archives -

human cases

YTD: 0 Counties: 0
No cases of human WNV illness have been reported positive for WNV in 2016.
 

dead birds

YTD: 53 Counties: 6
There were 28 new WNV positive dead birds reported in California last week from the following counties: Los Angeles (4), Orange (3), Sacramento (2), San Diego (14), and Santa Clara (5).

53 dead birds from 6 counties have tested positive for WNV in 2016.

 

mosquito samples

YTD: 27 Counties: 8
There were 8 new WNV positive mosquito samples reported in California last week from the following counties: Kern (1), Los Angeles (1), Riverside (2), San Bernardino (1), San Joaquin (2), and Tulare (1). This is the first indication of WNV from Kern and San Joaquin counties this year.

27 mosquito samples from 8 counties have tested positive for WNV in 2016.

 

sentinel chickens

YTD: 0 Counties: 0
No sentinel chickens have tested positive for WNV in 2016.

Be a West Nile Watcher

Help us track down the West Nile Virus by reporting all dead birds. You can submit an online report by clicking on the button on the right.

2003-2015 WNV Activity Summary

Element 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 Total
Human cases (fatal) 31 (0) 779 (29) 880 (19) 278 (7) 380 (21) 445 (15) 112 (4) 111 (6) 158 (9) 479 (20) 379 (15) 801 (31) 783 (53) 5,588 (229)
Horses 12 540 456 58 28 32 18 19 15 22 13 03 03 1,202
Dead birds 96 3,232 3,046 1,446 1,396 2,569 515 416 688 1,644 1,251 2,442 1,349 20,090
Mosquito samples 32 1,136 1,242 832 1,007 2,003 1,063 1,305 2,087 2849 2,528 3,340 3,329 22,753
Sentinel chickens 70 809 1,053 640 510 585 443 281 391 540 485 443 449 6,699
Squirrels - 49 48 32 26 32 10 24 24 23 03 03 03 276
1 There were 20 imported human cases. 2 There were 3 imported horse cases. 3 No longer monitored.

Having problems with mosquitoes?

Locate your local mosquito and vector control agency
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Compared to previous year and previous five-year average to date

As of May 27, 2016201620155Y AVG
Counties11139
Human cases010
Dead birds535022
Mosquito samples274016
Sentinel chickens000
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2015 YTD activity -

WNV Reports

Weekly Report

05.27 Arbovirus Bulletin #12
05.27 2016 YTD WNV Activity Map
05.20 Arbovirus Bulletin #11

Humans

03.21 2015 Human WNV Incidence Report
03.21 2003-2015 WNV Case Summary
03.09 2014 Human WNV Incidence Report

Dead Birds

05.27Positive Species for 2016
05.27Reported, Tested, Positive 2016
05.27Positive Counts by City/County for 2016

Mosquitoes

05.27 AMOR - EVS Week 20
05.27 AMOR - GRAVID Week 20
05.27 AMOR - NJLT Week 20
- view report archives -