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 Angeles-
Madera-
Marin-
Mariposa-
Mendocino-
Merced-
Modoc-
Mono-
Monterey-
Napa-
Nevada-
Orange-
Placer-
Plumas-
Riverside-
Sacramento-
San Benito-
San Bernardino-
San Diego1
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-
Total1

WNV Activity by County
Printable Version
2018 | 2017 | 2016 | 2015 | 2014
2013 | 2012 | 2011
2010 | 2009 | 2008
2007

Data on this website are updated every Friday by 4pm. Due to different reporting schedules, case totals here may not always reflect those reported by local health departments. Updates during the off season (January-April) are less frequent.
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 2018: 2

Orange, and San Diego.

Reporting a Dead Bird Video


West Nile virus and Dead Bird Hotline
The West Nile virus and Dead Bird Hotline is staffed with live operators from mid-April to mid-October each year.

- 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 2019.
 

horses

YTD: 0 Counties: 0
No horses have tested positive for WNV in 2019.
 

dead birds

YTD: 1 Counties: 1

1 dead bird from 1 county has tested positive for WNV in 2019.

 

mosquito samples

YTD: 1 Counties: 1

1 mosquito sample from 1 county has tested positive for WNV in 2019.

A mosquito sample may contain up to 50 individual mosquitoes.

 

sentinel chickens

YTD: 0 Counties: 0
No sentinel chickens have tested positive for WNV in 2019.

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.

2003-2018 WNV Activity Summary

Element 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 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) 782 (53) 442 (19) 553 (44) 218 (11) 6,800 (303)
Horses 12 540 456 58 28 32 18 19 15 22 23 153 193 213 21 11 1,299
Dead birds 96 3,232 3,046 1,446 1,396 2,569 515 416 688 1,644 1,251 2,442 1,349 1,352 510 501 22,093
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 3,528 3,371 1,963 31,615
Sentinel chickens 70 809 1,053 640 510 585 443 281 391 540 485 443 449 343 305 163 7,510
Squirrels - 49 48 32 26 32 10 24 24 23 03 03 03 03 03 03 276
1 There were 20 imported human cases. 2 There were 3 imported horse cases. 3 Not monitored this year.

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

As of Apr 19, 2019201920185Y AVG
Counties224
Human cases000
Dead birds148
Mosquito samples101
Sentinel chickens000
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2019 YTD activity -

WNV Reports

Weekly Report

04.19 Arbovirus Bulletin #3
04.12 Arbovirus Bulletin #2
04.09 Arbovirus Bulletin #1

Humans

04.03 2018 Human WNV Incidence Report
04.03 2003-2018 WNV Case Summary
03.29 2017 Human WNV Incidence Report

Dead Birds

04.19Positive Counts by City/County for 2019
04.19Positive Species for 2019
04.19Reported, Tested, Positive 2019

Mosquitoes

04.19 AMOR - EVS Week 15
04.19 AMOR - GRAVID Week 15
04.19 AMOR - NJLT Week 15
- view report archives -