Case Counts by County
| County | Human cases | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 1 | | Calaveras | - | | Colusa | - | | Contra Costa | 1 | | Del Norte | - | | El Dorado | - | | Fresno | 4 | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 1 | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | - | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | - | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 3 | | Placer | - | | Plumas | - | | Riverside | - | | Sacramento | - | | San Benito | - | | San Bernardino | - | | San Diego | - | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | 1 | | Sonoma | - | | Stanislaus | 5 | | Sutter | - | | Tehama | - | | Trinity | - | | Tulare | 3 | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | - |
| Total | 19 |
| County | Dead birds | | Alameda | 13 | | Alpine | - | | Amador | - | | Butte | 2 | | Calaveras | - | | Colusa | 1 | | Contra Costa | 19 | | Del Norte | - | | El Dorado | 1 | | Fresno | 7 | | Glenn | 1 | | Humboldt | 1 | | Imperial | - | | Inyo | - | | Kern | 2 | | Kings | 1 | | Lake | 5 | | Lassen | - | | Los Angeles | 9 | | Madera | 4 | | Marin | 2 | | Mariposa | - | | Mendocino | - | | Merced | - | | Modoc | - | | Mono | - | | Monterey | - | | Napa | 5 | | Nevada | - | | Orange | 55 | | Placer | 16 | | Plumas | - | | Riverside | - | | Sacramento | 143 | | San Benito | - | | San Bernardino | 2 | | San Diego | 1 | | San Francisco | - | | San Joaquin | 23 | | San Luis Obispo | - | | San Mateo | 3 | | Santa Barbara | - | | Santa Clara | 429 | | Santa Cruz | 1 | | Shasta | 2 | | Sierra | - | | Siskiyou | - | | Solano | 27 | | Sonoma | 8 | | Stanislaus | 17 | | Sutter | 13 | | Tehama | - | | Trinity | - | | Tulare | 32 | | Tuolumne | - | | Ventura | 1 | | Yolo | 21 | | Yuba | 5 |
| Total | 872 |
| County | Mosquito samples | | Alameda | 2 | | Alpine | - | | Amador | - | | Butte | 12 | | Calaveras | - | | Colusa | - | | Contra Costa | 7 | | Del Norte | - | | El Dorado | - | | Fresno | 45 | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 30 | | Kings | 36 | | Lake | 18 | | Lassen | - | | Los Angeles | 30 | | Madera | 9 | | Marin | 3 | | Mariposa | - | | Mendocino | - | | Merced | 3 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 81 | | Placer | 27 | | Plumas | - | | Riverside | 4 | | Sacramento | 187 | | San Benito | - | | San Bernardino | 29 | | San Diego | - | | San Francisco | - | | San Joaquin | 91 | | San Luis Obispo | - | | San Mateo | 3 | | Santa Barbara | - | | Santa Clara | 17 | | Santa Cruz | - | | Shasta | 6 | | Sierra | - | | Siskiyou | - | | Solano | 6 | | Sonoma | 2 | | Stanislaus | 39 | | Sutter | 26 | | Tehama | - | | Trinity | - | | Tulare | 172 | | Tuolumne | - | | Ventura | - | | Yolo | 80 | | Yuba | 13 |
| Total | 978 |
| County | Sentinel chickens | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 5 | | Calaveras | - | | Colusa | - | | Contra Costa | 6 | | Del Norte | - | | El Dorado | - | | Fresno | - | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | - | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | 2 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 1 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | - | | Placer | - | | Plumas | - | | Riverside | - | | Sacramento | - | | San Benito | - | | San Bernardino | 5 | | San Diego | - | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | 6 | | Sonoma | - | | Stanislaus | 7 | | Sutter | 2 | | Tehama | - | | Trinity | - | | Tulare | 4 | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | 1 |
| Total | 39 |
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 2013 YTD
| As of Jul 28, 2014 | 2013 | 2014 |
| Counties | 33 | 35 |
| Human cases | 14 | 19 | | Dead birds | 325 | 872 | | Mosquito samples | 761 | 978 | | Sentinel chickens | 79 | 39 |
2013 YTD - Year to date corresponds to the same time last year.
- view all 2013 YTD activity -
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WNV Reports
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