Case Counts by County
| County | Human cases | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 19 | | Calaveras | - | | Colusa | 2 | | Contra Costa | 1 | | Del Norte | - | | El Dorado | 1 | | Fresno | 9 | | Glenn | 5 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 9 | | Kings | 2 | | Lake | 1 | | Lassen | - | | Los Angeles | 92 | | Madera | 4 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | - | | Modoc | - | | Mono | - | | Monterey | 1 | | Napa | - | | Nevada | - | | Orange | 18 | | Placer | 5 | | Plumas | - | | Riverside | 3 | | Sacramento | 18 | | San Benito | - | | San Bernardino | 6 | | San Diego | 11 | | San Francisco | - | | San Joaquin | 6 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | 1 | | Santa Cruz | - | | Shasta | 1 | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | 17 | | Sutter | 9 | | Tehama | 5 | | Trinity | - | | Tulare | 7 | | Tuolumne | - | | Ventura | 2 | | Yolo | 12 | | Yuba | 9 |
| Total | 276 |
| County | Dead birds | | Alameda | 11 | | Alpine | - | | Amador | - | | Butte | 21 | | Calaveras | - | | Colusa | - | | Contra Costa | 27 | | Del Norte | - | | El Dorado | 4 | | Fresno | 6 | | Glenn | 4 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | - | | Kings | 4 | | Lake | 4 | | Lassen | - | | Los Angeles | 113 | | Madera | 5 | | Marin | 5 | | Mariposa | - | | Mendocino | - | | Merced | 5 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | 1 | | Nevada | 2 | | Orange | 78 | | Placer | 28 | | Plumas | - | | Riverside | 14 | | Sacramento | 409 | | San Benito | - | | San Bernardino | 5 | | San Diego | 255 | | San Francisco | - | | San Joaquin | 35 | | San Luis Obispo | - | | San Mateo | 11 | | Santa Barbara | - | | Santa Clara | 85 | | Santa Cruz | 2 | | Shasta | 3 | | Sierra | - | | Siskiyou | - | | Solano | 13 | | Sonoma | 8 | | Stanislaus | 12 | | Sutter | 10 | | Tehama | - | | Trinity | - | | Tulare | 3 | | Tuolumne | - | | Ventura | 30 | | Yolo | 71 | | Yuba | 4 |
| Total | 1288 |
| County | Mosquito samples | | Alameda | 2 | | Alpine | - | | Amador | - | | Butte | 48 | | Calaveras | - | | Colusa | - | | Contra Costa | 9 | | Del Norte | - | | El Dorado | - | | Fresno | 180 | | Glenn | 11 | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 80 | | Kings | 118 | | Lake | 39 | | Lassen | - | | Los Angeles | 388 | | Madera | 99 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 12 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | 4 | | Nevada | - | | Orange | 382 | | Placer | 103 | | Plumas | - | | Riverside | 31 | | Sacramento | 454 | | San Benito | - | | San Bernardino | 79 | | San Diego | 65 | | San Francisco | - | | San Joaquin | 348 | | San Luis Obispo | - | | San Mateo | 5 | | Santa Barbara | - | | Santa Clara | 13 | | Santa Cruz | 3 | | Shasta | 12 | | Sierra | - | | Siskiyou | - | | Solano | 16 | | Sonoma | 2 | | Stanislaus | 256 | | Sutter | 68 | | Tehama | - | | Trinity | - | | Tulare | 257 | | Tuolumne | - | | Ventura | - | | Yolo | 258 | | Yuba | 18 |
| Total | 3360 |
| 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 | 4 | | Lassen | - | | Los Angeles | 99 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 33 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | 1 | | Orange | - | | Placer | 7 | | Plumas | - | | Riverside | - | | Sacramento | - | | San Benito | - | | San Bernardino | 20 | | San Diego | 9 | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | 3 | | Sierra | - | | Siskiyou | - | | Solano | 7 | | Sonoma | - | | Stanislaus | - | | Sutter | 32 | | Tehama | 8 | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | 3 | | Yuba | 13 |
| Total | 301 |
WNV Activity by County
Printable Version
2016 |
2015 |
2014
2013 |
2012 |
2011
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2009 |
2008
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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 30, 2016 | 2016 | 2015 | 5Y AVG |
| Counties | 37 | 40 | 38 |
| Human cases | 276 | 300 | 233 | | Dead birds | 1288 | 1016 | 1237 | | Mosquito samples | 3360 | 2890 | 2551 | | Sentinel chickens | 301 | 330 | 354 |
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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