Case Counts by County
| County | Human cases | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 21 | | Calaveras | - | | Colusa | 2 | | Contra Costa | 3 | | Del Norte | - | | El Dorado | 1 | | Fresno | 10 | | Glenn | 5 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 16 | | Kings | 7 | | Lake | 1 | | Lassen | - | | Los Angeles | 135 | | Madera | 6 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | - | | Modoc | - | | Mono | - | | Monterey | 1 | | Napa | - | | Nevada | - | | Orange | 33 | | Placer | 7 | | Plumas | - | | Riverside | 6 | | Sacramento | 23 | | San Benito | - | | San Bernardino | 8 | | San Diego | 17 | | San Francisco | - | | San Joaquin | 7 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | 1 | | Santa Cruz | - | | Shasta | 1 | | Sierra | - | | Siskiyou | - | | Solano | 3 | | Sonoma | - | | Stanislaus | 24 | | Sutter | 11 | | Tehama | 5 | | Trinity | - | | Tulare | 10 | | Tuolumne | - | | Ventura | 2 | | Yolo | 13 | | Yuba | 9 |
| Total | 388 |
| County | Dead birds | | Alameda | 11 | | Alpine | - | | Amador | - | | Butte | 22 | | Calaveras | - | | Colusa | - | | Contra Costa | 33 | | Del Norte | - | | El Dorado | 4 | | Fresno | 6 | | Glenn | 4 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | - | | Kings | 4 | | Lake | 5 | | Lassen | - | | Los Angeles | 121 | | Madera | 5 | | Marin | 5 | | Mariposa | - | | Mendocino | - | | Merced | 5 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | 1 | | Nevada | 2 | | Orange | 86 | | Placer | 30 | | Plumas | - | | Riverside | 16 | | Sacramento | 411 | | San Benito | - | | San Bernardino | 5 | | San Diego | 262 | | San Francisco | - | | San Joaquin | 37 | | San Luis Obispo | - | | San Mateo | 14 | | Santa Barbara | - | | Santa Clara | 89 | | Santa Cruz | 2 | | Shasta | 3 | | Sierra | - | | Siskiyou | - | | Solano | 13 | | Sonoma | 8 | | Stanislaus | 14 | | Sutter | 10 | | Tehama | - | | Trinity | - | | Tulare | 3 | | Tuolumne | - | | Ventura | 34 | | Yolo | 72 | | Yuba | 4 |
| Total | 1341 |
| County | Mosquito samples | | Alameda | 2 | | Alpine | - | | Amador | - | | Butte | 48 | | Calaveras | - | | Colusa | - | | Contra Costa | 11 | | Del Norte | - | | El Dorado | - | | Fresno | 185 | | Glenn | 11 | | Humboldt | - | | Imperial | 1 | | Inyo | - | | Kern | 80 | | Kings | 118 | | Lake | 39 | | Lassen | - | | Los Angeles | 434 | | Madera | 101 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 13 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | 4 | | Nevada | - | | Orange | 423 | | Placer | 103 | | Plumas | - | | Riverside | 32 | | Sacramento | 455 | | San Benito | - | | San Bernardino | 81 | | San Diego | 89 | | San Francisco | - | | San Joaquin | 350 | | San Luis Obispo | - | | San Mateo | 5 | | Santa Barbara | - | | Santa Clara | 13 | | Santa Cruz | 3 | | Shasta | 12 | | Sierra | - | | Siskiyou | - | | Solano | 16 | | Sonoma | 2 | | Stanislaus | 258 | | Sutter | 68 | | Tehama | - | | Trinity | - | | Tulare | 260 | | Tuolumne | - | | Ventura | - | | Yolo | 259 | | Yuba | 18 |
| Total | 3494 |
| County | Sentinel chickens | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 38 | | Calaveras | - | | Colusa | 9 | | Contra Costa | 5 | | Del Norte | - | | El Dorado | - | | Fresno | - | | Glenn | 10 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | - | | Kings | - | | Lake | 5 | | Lassen | - | | Los Angeles | 124 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 35 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | 1 | | Orange | - | | Placer | 7 | | Plumas | - | | Riverside | - | | Sacramento | 3 | | San Benito | - | | San Bernardino | 23 | | San Diego | 9 | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | 1 | | Santa Cruz | - | | Shasta | 3 | | Sierra | - | | Siskiyou | - | | Solano | 10 | | Sonoma | - | | Stanislaus | - | | Sutter | 33 | | Tehama | 8 | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | 4 | | Yuba | 13 |
| Total | 341 |
WNV Activity by County
Printable Version
2016 |
2015 |
2014
2013 |
2012 |
2011
2010 |
2009 |
2008
2007
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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.
- 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.
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human cases YTD: 388 Counties: 29There were 8 new WNV human cases reported in California last week from the following counties: Kern (1), Kings (1), Los Angeles (3), Madera (1), Riverside (1), and Stanislaus (1). 17 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 (1), Stanislaus (1), Sutter (1), Tulare (1), and Yolo (1). 388 human cases from 29 counties have tested positive for WNV in 2016.
dead birds YTD: 1,341 Counties: 33There was 1 new WNV positive dead bird reported in California last week from Orange County. 1,341 dead birds from 33 counties have tested positive for WNV in 2016.
mosquito samples YTD: 3,494 Counties: 31There were 3 new WNV positive mosquito samples reported in California last week from Los Angeles County. 3,494 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: 341 Counties: 19There were 6 new WNV positive sentinel chickens reported in California last week from the following counties: Los Angeles (4), and Merced (2). 341 sentinel chickens from 19 counties have tested positive for WNV in 2016.
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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.
| 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 |
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1 There were 20 imported human cases.
2 There were 3 imported horse cases.
3 No longer monitored.
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Locate your local mosquito and vector control agency
Compared to previous year and previous five-year average to date
| As of Nov 10, 2016 | 2016 | 2015 | 5Y AVG |
| Counties | 38 | 40 | 40 |
| Human cases | 388 | 587 | 438 | | Dead birds | 1341 | 1296 | 1447 | | Mosquito samples | 3494 | 3305 | 2809 | | Sentinel chickens | 341 | 430 | 450 |
YTD - Year to date corresponds to the same time last year or last five years.
- view all 2015 YTD activity -
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WNV Reports
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