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

Case Counts by County

CountyDead birds
Alameda11
Alpine-
Amador-
Butte22
Calaveras-
Colusa-
Contra Costa33
Del Norte-
El Dorado4
Fresno6
Glenn4
Humboldt-
Imperial-
Inyo-
Kern-
Kings4
Lake5
Lassen-
Los Angeles124
Madera5
Marin5
Mariposa-
Mendocino-
Merced5
Modoc-
Mono-
Monterey-
Napa1
Nevada2
Orange87
Placer30
Plumas-
Riverside16
Sacramento411
San Benito-
San Bernardino5
San Diego262
San Francisco-
San Joaquin37
San Luis Obispo-
San Mateo15
Santa Barbara-
Santa Clara89
Santa Cruz2
Shasta3
Sierra-
Siskiyou-
Solano13
Sonoma8
Stanislaus14
Sutter10
Tehama-
Trinity-
Tulare3
Tuolumne-
Ventura34
Yolo72
Yuba4
Total1346

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: 38

Alameda, Butte, Colusa, Contra Costa, El Dorado, Fresno, Glenn, Imperial, Kern, Kings, Lake, Los Angeles, Madera, Marin, Merced, Monterey, Napa, Nevada, Orange, Placer, Riverside, Sacramento, San Bernardino, San Diego, San Joaquin, San Mateo, Santa Clara, Santa Cruz, Shasta, Solano, Sonoma, Stanislaus, Sutter, Tehama, Tulare, Ventura, Yolo, and Yuba.

human cases

YTD: 406 Counties: 29
There were 10 new WNV human cases reported in California this week from the following counties: Contra Costa (1), Fresno (1), Los Angeles (5), Sacramento (1), Stanislaus (1), and Yuba (1).

18 WNV-related fatalities have been reported to CDPH in Los Angeles (5), Orange (1), Placer (1), Sacramento (1), San Bernardino (2), San Diego (2), San Joaquin (2), Stanislaus (1), Sutter (1), Tulare (1), and Yolo (1).

406 human cases from 29 counties have tested positive for WNV in 2016.

 

dead birds

YTD: 1,346 Counties: 33
There was 1 new WNV positive dead bird reported in California last week from San Mateo County.

1,346 dead birds from 33 counties have tested positive for WNV in 2016.

 

mosquito samples

YTD: 3,509 Counties: 31
There were 13 new WNV positive mosquito samples reported in California this week from the following counties: Los Angeles (1), and Orange (12).

3,509 mosquito samples from 31 counties have tested positive for WNV in 2016.

A mosquito sample may contain up to 50 individual mosquitoes.

 

sentinel chickens

YTD: 343 Counties: 19

343 sentinel chickens from 19 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 Dec 02, 2016201620155Y AVG
Counties384040
Human cases406675475
Dead birds134613341467
Mosquito samples350933262825
Sentinel chickens343449460
YTD - Year to date corresponds to the same time last year or last five years.

- view all 2015 YTD activity -

WNV Reports

Weekly Report

12.02 Arbovirus Bulletin #38
12.02 2016 YTD WNV Activity Map
11.29 2016 US Arboviral Activity Update

Humans

12.02 2016 Human WNV Incidence Report
11.16 2003-2016 WNV Case Summary
03.21 2015 Human WNV Incidence Report

Dead Birds

12.02Positive Species for 2016
12.02Reported, Tested, Positive 2016
12.02Positive Counts by City/County for 2016

Mosquitoes

11.10 AMOR - EVS Week 44
11.10 AMOR - GRAVID Week 44
11.10 AMOR - NJLT Week 44
- view report archives -