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-
Butte1
Calaveras-
Colusa-
Contra Costa1
Del Norte-
El Dorado-
Fresno2
Glenn-
Humboldt-
Imperial-
Inyo-
Kern-
Kings-
Lake-
Lassen-
Los Angeles24
Madera1
Marin1
Mariposa-
Mendocino-
Merced-
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange6
Placer-
Plumas-
Riverside1
Sacramento109
San Benito-
San Bernardino-
San Diego100
San Francisco-
San Joaquin2
San Luis Obispo-
San Mateo-
Santa Barbara-
Santa Clara19
Santa Cruz-
Shasta-
Sierra-
Siskiyou-
Solano1
Sonoma-
Stanislaus2
Sutter2
Tehama-
Trinity-
Tulare-
Tuolumne-
Ventura4
Yolo1
Yuba-
Total277

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

Human data is updated every Friday by 4pm. Dead bird data is updated every Wednesday and Friday by 4pm. Mosquito and sentinel chicken data are updated on Fridays 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: 21

New counties highlighted in red.
Butte, Contra Costa, Fresno, Kern, Kings, Los Angeles, Madera, Marin, Orange, Riverside, Sacramento, San Bernardino, San Diego, San Joaquin, Santa Clara, Solano, Stanislaus, Sutter, Tulare, Ventura, and Yolo.

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: 277 Counties: 17
There were 86 new WNV positive dead birds reported in California last week from the following counties: Butte (1), Fresno (1), Los Angeles (10), Marin (1), Riverside (1), Sacramento (44), San Diego (18), San Joaquin (1), Santa Clara (5), Sutter (1), and Ventura (3). This is the first WNV positive dead bird from Riverside County this year. This is the first indication of WNV from Butte and Marin counties this year.

277 dead birds from 17 counties have tested positive for WNV in 2016.

 

mosquito samples

YTD: 264 Counties: 16
There were 79 new WNV positive mosquito samples reported in California last week from the following counties: Fresno (8), Kern (1), Kings (2), Los Angeles (3), Madera (2), Orange (5), Riverside (1), Sacramento (33), San Bernardino (1), San Joaquin (9), Stanislaus (6), Sutter (4), Tulare (2), and Yolo (2). This is the first WNV positive mosquito sample from Yolo County this year.

264 mosquito samples from 16 counties have tested positive for WNV in 2016.

 

sentinel chickens

YTD: 4 Counties: 2
There have been 2 new WNV positive sentinel chickens reported in California last week from Los Angeles (1) and San Diego (1) counties. This is the first WNV positive sentinel chicken from Los Angeles County this year.

4 sentinel chickens from 2 counties 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.

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Compared to previous year and previous five-year average to date

As of Jun 24, 2016201620155Y AVG
Counties213120
Human cases001
Dead birds277102106
Mosquito samples264180122
Sentinel chickens431
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2015 YTD activity -

WNV Reports

Weekly Report

06.24 Arbovirus Bulletin #16
06.24 2016 YTD WNV Activity Map
06.17 Arbovirus Bulletin #15

Humans

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

Dead Birds

06.24Positive Species for 2016
06.24Reported, Tested, Positive 2016
06.24Positive Counts by City/County for 2016

Mosquitoes

06.24 AMOR - EVS Week 24
06.24 AMOR - GRAVID Week 24
06.24 AMOR - NJLT Week 24
- view report archives -