Case Counts by County
| County | Human cases | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 1 | | Calaveras | - | | Colusa | - | | Contra Costa | - | | Del Norte | - | | El Dorado | - | | Fresno | - | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 6 | | Kings | 1 | | Lake | - | | Lassen | - | | Los Angeles | 23 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | - | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | - | | Placer | - | | Plumas | - | | Riverside | 1 | | Sacramento | - | | San Benito | - | | San Bernardino | 5 | | San Diego | - | | San Francisco | - | | San Joaquin | 1 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | 2 | | Sutter | - | | Tehama | - | | Trinity | - | | Tulare | 1 | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | - |
| Total | 41 |
| County | Dead birds | | Alameda | 1 | | Alpine | - | | Amador | - | | Butte | 2 | | Calaveras | - | | Colusa | 1 | | Contra Costa | 5 | | Del Norte | - | | El Dorado | 1 | | Fresno | 2 | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 3 | | Kings | 1 | | Lake | 1 | | Lassen | - | | Los Angeles | 32 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 1 | | Modoc | - | | Mono | - | | Monterey | 1 | | Napa | - | | Nevada | 1 | | Orange | 15 | | Placer | 1 | | Plumas | - | | Riverside | 23 | | Sacramento | 40 | | San Benito | - | | San Bernardino | 27 | | San Diego | 14 | | San Francisco | - | | San Joaquin | 6 | | San Luis Obispo | - | | San Mateo | 1 | | Santa Barbara | - | | Santa Clara | 5 | | Santa Cruz | 1 | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | 1 | | Sonoma | - | | Stanislaus | 3 | | Sutter | 1 | | Tehama | - | | Trinity | - | | Tulare | 8 | | Tuolumne | - | | Ventura | - | | Yolo | 1 | | Yuba | 4 |
| Total | 203 |
| County | Mosquito samples | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 26 | | Calaveras | - | | Colusa | - | | Contra Costa | 3 | | Del Norte | - | | El Dorado | - | | Fresno | 74 | | Glenn | 11 | | Humboldt | - | | Imperial | - | | Inyo | 6 | | Kern | 129 | | Kings | 57 | | Lake | 8 | | Lassen | - | | Los Angeles | 268 | | Madera | 25 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 24 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 94 | | Placer | 24 | | Plumas | - | | Riverside | 144 | | Sacramento | 67 | | San Benito | - | | San Bernardino | 201 | | San Diego | 3 | | San Francisco | - | | San Joaquin | 154 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | 3 | | Sonoma | - | | Stanislaus | 110 | | Sutter | 15 | | Tehama | - | | Trinity | - | | Tulare | 555 | | Tuolumne | - | | Ventura | - | | Yolo | 33 | | Yuba | 15 |
| Total | 2049 |
| County | Sentinel chickens | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 9 | | Calaveras | - | | Colusa | - | | Contra Costa | 4 | | Del Norte | - | | El Dorado | - | | Fresno | - | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | - | | Kings | - | | Lake | 1 | | Lassen | - | | Los Angeles | 43 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 13 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | - | | Placer | - | | Plumas | - | | Riverside | - | | Sacramento | - | | San Benito | - | | San Bernardino | 12 | | San Diego | - | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | - | | Sierra | - | | Siskiyou | - | | Solano | 1 | | Sonoma | - | | Stanislaus | - | | Sutter | 7 | | Tehama | - | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | 2 |
| Total | 92 |
WNV Activity by County
Printable Version
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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 Aug 18, 2017 | 2017 | 2016 | 5Y AVG |
| Counties | 32 | 35 | 36 |
| Human cases | 41 | 46 | 56 | | Dead birds | 203 | 1010 | 872 | | Mosquito samples | 2049 | 2565 | 1820 | | Sentinel chickens | 92 | 161 | 149 |
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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