Case Counts by County
| County | Human cases | | Alameda | 1 | | Alpine | - | | Amador | - | | Butte | 25 | | Calaveras | - | | Colusa | 5 | | Contra Costa | 5 | | Del Norte | - | | El Dorado | - | | Fresno | 42 | | Glenn | 12 | | Humboldt | - | | Imperial | 2 | | Inyo | - | | Kern | 13 | | Kings | 3 | | Lake | 1 | | Lassen | - | | Los Angeles | 251 | | Madera | 3 | | Marin | - | | Mariposa | - | | Mendocino | 1 | | Merced | 1 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 266 | | Placer | 7 | | Plumas | - | | Riverside | 11 | | Sacramento | 10 | | San Benito | - | | San Bernardino | 21 | | San Diego | 11 | | San Francisco | - | | San Joaquin | 9 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | 11 | | Santa Cruz | - | | Shasta | 2 | | Sierra | - | | Siskiyou | - | | Solano | 1 | | Sonoma | - | | Stanislaus | 38 | | Sutter | 7 | | Tehama | 4 | | Trinity | - | | Tulare | 19 | | Tuolumne | - | | Ventura | 1 | | Yolo | 10 | | Yuba | 5 |
| Total | 798 |
| County | Dead birds | | Alameda | 96 | | Alpine | - | | Amador | - | | Butte | 22 | | Calaveras | - | | Colusa | 4 | | Contra Costa | 44 | | Del Norte | - | | El Dorado | 7 | | Fresno | 9 | | Glenn | 4 | | Humboldt | 2 | | Imperial | - | | Inyo | - | | Kern | 3 | | Kings | 3 | | Lake | 18 | | Lassen | - | | Los Angeles | 99 | | Madera | 5 | | Marin | 6 | | Mariposa | - | | Mendocino | - | | Merced | 8 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | 12 | | Nevada | - | | Orange | 431 | | Placer | 40 | | Plumas | - | | Riverside | 1 | | Sacramento | 294 | | San Benito | - | | San Bernardino | 17 | | San Diego | 39 | | San Francisco | - | | San Joaquin | 53 | | San Luis Obispo | - | | San Mateo | 21 | | Santa Barbara | 2 | | Santa Clara | 925 | | Santa Cruz | 1 | | Shasta | 6 | | Sierra | - | | Siskiyou | - | | Solano | 33 | | Sonoma | 37 | | Stanislaus | 47 | | Sutter | 19 | | Tehama | - | | Trinity | - | | Tulare | 40 | | Tuolumne | - | | Ventura | 7 | | Yolo | 71 | | Yuba | 16 |
| Total | 2442 |
| County | Mosquito samples | | Alameda | 16 | | Alpine | - | | Amador | - | | Butte | 40 | | Calaveras | - | | Colusa | 1 | | Contra Costa | 25 | | Del Norte | - | | El Dorado | - | | Fresno | 138 | | Glenn | 8 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 111 | | Kings | 150 | | Lake | 71 | | Lassen | - | | Los Angeles | 356 | | Madera | 37 | | Marin | 3 | | Mariposa | - | | Mendocino | - | | Merced | 11 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 499 | | Placer | 77 | | Plumas | - | | Riverside | 91 | | Sacramento | 487 | | San Benito | - | | San Bernardino | 97 | | San Diego | 1 | | San Francisco | - | | San Joaquin | 239 | | San Luis Obispo | - | | San Mateo | 15 | | Santa Barbara | - | | Santa Clara | 30 | | Santa Cruz | - | | Shasta | 33 | | Sierra | - | | Siskiyou | - | | Solano | 11 | | Sonoma | 9 | | Stanislaus | 176 | | Sutter | 52 | | Tehama | - | | Trinity | - | | Tulare | 311 | | Tuolumne | - | | Ventura | - | | Yolo | 221 | | Yuba | 24 |
| Total | 3340 |
| County | Sentinel chickens | | Alameda | 1 | | Alpine | - | | Amador | - | | Butte | 37 | | Calaveras | - | | Colusa | 9 | | Contra Costa | 15 | | Del Norte | - | | El Dorado | - | | Fresno | - | | Glenn | 9 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | - | | Kings | - | | Lake | 5 | | Lassen | - | | Los Angeles | 146 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 11 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | 2 | | Orange | - | | Placer | - | | Plumas | - | | Riverside | 43 | | Sacramento | 10 | | San Benito | - | | San Bernardino | 32 | | San Diego | 2 | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | 5 | | Santa Cruz | - | | Shasta | 12 | | Sierra | - | | Siskiyou | - | | Solano | 23 | | Sonoma | 3 | | Stanislaus | 12 | | Sutter | 31 | | Tehama | 13 | | Trinity | - | | Tulare | 4 | | Tuolumne | - | | Ventura | - | | Yolo | 9 | | Yuba | 9 |
| Total | 443 |
WNV Activity by County
Printable Version
2014 |
2013 |
2012
2011 |
2010 |
2009
2008 |
2007
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Report a Dead Bird
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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 Dec 22, 2014 | 2014 | 2013 | 5Y AVG |
| Counties | 40 | 44 | 39 |
| Human cases | 798 | 375 | 383 | | Dead birds | 2442 | 1251 | 1288 | | Mosquito samples | 3340 | 2528 | 2422 | | Sentinel chickens | 443 | 485 | 428 |
YTD - Year to date corresponds to the same time last year or last five years.
- view all 2013 YTD activity -
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WNV Reports
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