Case Counts by County
| County | Human cases | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 2 | | Calaveras | - | | Colusa | - | | Contra Costa | - | | Del Norte | - | | El Dorado | - | | Fresno | 2 | | Glenn | - | | Humboldt | - | | Imperial | 1 | | Inyo | 3 | | Kern | 12 | | Kings | 1 | | Lake | - | | Lassen | - | | Los Angeles | 65 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | - | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 11 | | Placer | - | | Plumas | - | | Riverside | 7 | | Sacramento | 1 | | San Benito | - | | San Bernardino | 17 | | San Diego | - | | San Francisco | - | | San Joaquin | 9 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | 7 | | Sutter | 1 | | Tehama | - | | Trinity | - | | Tulare | 4 | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | - |
| Total | 143 |
| County | Horses | | Alameda | - | | Alpine | - | | Amador | - | | Butte | - | | Calaveras | - | | Colusa | - | | Contra Costa | 1 | | Del Norte | - | | El Dorado | - | | Fresno | 1 | | Glenn | 1 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 2 | | Kings | - | | Lake | - | | Lassen | 1 | | Los Angeles | - | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | - | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | - | | Placer | - | | Plumas | 1 | | Riverside | 4 | | Sacramento | - | | San Benito | - | | San Bernardino | - | | San Diego | - | | San Francisco | - | | San Joaquin | 1 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | - | | Sutter | - | | Tehama | 1 | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | - |
| Total | 13 |
| County | Dead birds | | Alameda | 1 | | Alpine | - | | Amador | - | | Butte | 4 | | Calaveras | - | | Colusa | 1 | | Contra Costa | 10 | | Del Norte | - | | El Dorado | 1 | | Fresno | 5 | | Glenn | 2 | | Humboldt | 1 | | Imperial | - | | Inyo | - | | Kern | 3 | | Kings | 1 | | Lake | 3 | | Lassen | - | | Los Angeles | 59 | | Madera | 1 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 1 | | Modoc | - | | Mono | - | | Monterey | 1 | | Napa | - | | Nevada | 1 | | Orange | 37 | | Placer | 2 | | Plumas | - | | Riverside | 29 | | Sacramento | 65 | | San Benito | - | | San Bernardino | 37 | | San Diego | 22 | | San Francisco | 1 | | San Joaquin | 6 | | San Luis Obispo | - | | San Mateo | 1 | | Santa Barbara | - | | Santa Clara | 7 | | Santa Cruz | 1 | | Shasta | 2 | | Sierra | - | | Siskiyou | - | | Solano | 2 | | Sonoma | 2 | | Stanislaus | 4 | | Sutter | 2 | | Tehama | - | | Trinity | - | | Tulare | 8 | | Tuolumne | - | | Ventura | 1 | | Yolo | 6 | | Yuba | 6 |
| Total | 336 |
| County | Mosquito samples | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 46 | | Calaveras | - | | Colusa | - | | Contra Costa | 6 | | Del Norte | - | | El Dorado | - | | Fresno | 158 | | Glenn | 12 | | Humboldt | - | | Imperial | - | | Inyo | 8 | | Kern | 149 | | Kings | 75 | | Lake | 16 | | Lassen | - | | Los Angeles | 436 | | Madera | 58 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 39 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 221 | | Placer | 50 | | Plumas | - | | Riverside | 184 | | Sacramento | 129 | | San Benito | - | | San Bernardino | 240 | | San Diego | 5 | | San Francisco | - | | San Joaquin | 224 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | 6 | | Sonoma | 1 | | Stanislaus | 186 | | Sutter | 16 | | Tehama | - | | Trinity | - | | Tulare | 620 | | Tuolumne | - | | Ventura | - | | Yolo | 76 | | Yuba | 18 |
| Total | 2979 |
| County | Sentinel chickens | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 29 | | Calaveras | - | | Colusa | - | | Contra Costa | 4 | | Del Norte | - | | El Dorado | - | | Fresno | - | | Glenn | 1 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | - | | Kings | - | | Lake | 1 | | Lassen | - | | Los Angeles | 86 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 19 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | - | | Placer | 2 | | Plumas | - | | Riverside | - | | Sacramento | 2 | | San Benito | 1 | | San Bernardino | 33 | | San Diego | - | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | 3 | | Sonoma | - | | Stanislaus | - | | Sutter | 18 | | Tehama | - | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | 5 |
| Total | 204 |
WNV Activity by County
Printable Version
2017 |
2016 |
2015 |
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 Sep 15, 2017 | 2017 | 2016 | 5Y AVG |
| Counties | 42 | 36 | 38 |
| Human cases | 143 | 199 | 183 | | Dead birds | 336 | 1238 | 1262 | | Mosquito samples | 2979 | 3190 | 2633 | | Sentinel chickens | 204 | 280 | 301 |
YTD - Year to date corresponds to the same time last year or last five years.
- view all 2016 YTD activity -
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WNV Reports
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