Case Counts by County
| County | Human cases | | Alameda | - | | Alpine | - | | Amador | 1 | | Butte | 6 | | Calaveras | - | | Colusa | - | | Contra Costa | 1 | | Del Norte | - | | El Dorado | - | | Fresno | 3 | | Glenn | 2 | | Humboldt | 1 | | Imperial | - | | Inyo | - | | Kern | 5 | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | 11 | | Madera | 2 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 1 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 1 | | Placer | 7 | | Plumas | - | | Riverside | 7 | | Sacramento | 1 | | San Benito | - | | San Bernardino | 3 | | San Diego | - | | San Francisco | - | | San Joaquin | 9 | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | 1 | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | 6 | | Sutter | - | | Tehama | 1 | | Trinity | - | | Tulare | 1 | | Tuolumne | 1 | | Ventura | 1 | | Yolo | 6 | | Yuba | 1 |
| Total | 79 |
| County | Horses | | Alameda | - | | Alpine | - | | Amador | - | | Butte | - | | Calaveras | - | | Colusa | - | | Contra Costa | - | | Del Norte | - | | El Dorado | - | | Fresno | - | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | 1 | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | - | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | - | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | - | | Placer | 1 | | Plumas | - | | Riverside | - | | Sacramento | 2 | | San Benito | - | | San Bernardino | - | | San Diego | - | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | - | | Santa Cruz | - | | Shasta | 1 | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | 1 | | Sutter | - | | Tehama | - | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | - | | Yuba | - |
| Total | 6 |
| County | Dead birds | | Alameda | 16 | | Alpine | - | | Amador | - | | Butte | 3 | | Calaveras | - | | Colusa | - | | Contra Costa | 11 | | Del Norte | - | | El Dorado | 2 | | Fresno | - | | Glenn | - | | Humboldt | 1 | | Imperial | - | | Inyo | - | | Kern | - | | Kings | - | | Lake | - | | Lassen | - | | Los Angeles | 9 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | - | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 5 | | Placer | 40 | | Plumas | - | | Riverside | 5 | | Sacramento | 232 | | San Benito | - | | San Bernardino | - | | San Diego | - | | San Francisco | - | | San Joaquin | 11 | | San Luis Obispo | - | | San Mateo | 5 | | Santa Barbara | - | | Santa Clara | 43 | | Santa Cruz | 2 | | Shasta | 4 | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | 1 | | Sutter | 4 | | Tehama | - | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | 36 | | Yuba | - |
| Total | 430 |
| County | Mosquito samples | | Alameda | 11 | | Alpine | - | | Amador | - | | Butte | 47 | | Calaveras | - | | Colusa | - | | Contra Costa | 15 | | Del Norte | - | | El Dorado | - | | Fresno | 102 | | Glenn | 4 | | Humboldt | - | | Imperial | 1 | | Inyo | - | | Kern | 45 | | Kings | 19 | | Lake | 4 | | Lassen | - | | Los Angeles | 34 | | Madera | 48 | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 8 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | 62 | | Placer | 228 | | Plumas | - | | Riverside | 34 | | Sacramento | 288 | | San Benito | - | | San Bernardino | 10 | | San Diego | 3 | | San Francisco | - | | San Joaquin | 459 | | San Luis Obispo | - | | San Mateo | 2 | | Santa Barbara | - | | Santa Clara | 4 | | Santa Cruz | - | | Shasta | 7 | | Sierra | - | | Siskiyou | - | | Solano | 2 | | Sonoma | - | | Stanislaus | 99 | | Sutter | 28 | | Tehama | - | | Trinity | - | | Tulare | 69 | | Tuolumne | - | | Ventura | - | | Yolo | 89 | | Yuba | 8 |
| Total | 1730 |
| County | Sentinel chickens | | Alameda | - | | Alpine | - | | Amador | - | | Butte | 32 | | Calaveras | - | | Colusa | 2 | | Contra Costa | 13 | | Del Norte | - | | El Dorado | - | | Fresno | - | | Glenn | - | | Humboldt | - | | Imperial | - | | Inyo | - | | Kern | - | | Kings | - | | Lake | 1 | | Lassen | - | | Los Angeles | 7 | | Madera | - | | Marin | - | | Mariposa | - | | Mendocino | - | | Merced | 14 | | Modoc | - | | Mono | - | | Monterey | - | | Napa | - | | Nevada | - | | Orange | - | | Placer | 4 | | Plumas | - | | Riverside | - | | Sacramento | 4 | | San Benito | 1 | | San Bernardino | - | | San Diego | - | | San Francisco | - | | San Joaquin | - | | San Luis Obispo | - | | San Mateo | - | | Santa Barbara | - | | Santa Clara | 5 | | Santa Cruz | - | | Shasta | 4 | | Sierra | - | | Siskiyou | - | | Solano | - | | Sonoma | - | | Stanislaus | - | | Sutter | 19 | | Tehama | - | | Trinity | - | | Tulare | - | | Tuolumne | - | | Ventura | - | | Yolo | 4 | | Yuba | 2 |
| Total | 112 |
WNV Activity by County
Printable Version
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2017 |
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Compared to previous year and previous five-year average to date
| As of Sep 14, 2018 | 2018 | 2017 | 5Y AVG |
| Counties | 37 | 39 | 39 |
| Human cases | 79 | 143 | 188 | | Dead birds | 430 | 337 | 1087 | | Mosquito samples | 1730 | 2979 | 2773 | | Sentinel chickens | 112 | 204 | 277 |
YTD - Year to date corresponds to the same time last year or last five years.
- view all 2018 YTD activity -
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WNV Reports
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